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Finding the Fourth Proportional to 721,907.52, 996,220.32 and 399,610.80

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Solution

The fourth proportional to 721,907.52, 996,220.32 and 399,610.80 is: 551,456.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,907.52 : 996,220.32 = 399,610.80 : x
  2. Step 2: Convert to fraction form
    721,907.52/996,220.32 = 399,610.80/x
  3. Step 3: Cross multiply
    721,907.52x = 996,220.32 × 399,610.80
  4. Step 4: Simplify right side
    721,907.52x = 398,100,399,051.46
  5. Step 5: Solve for x
    x = 398,100,399,051.46/721,907.52
  6. Step 6: Final answer
    x = 551,456.23

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.