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Finding the Fourth Proportional to 721,788.77, 996,053.60 and 399,479.64

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Solution

The fourth proportional to 721,788.77, 996,053.60 and 399,479.64 is: 551,273.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,788.77 : 996,053.60 = 399,479.64 : x
  2. Step 2: Convert to fraction form
    721,788.77/996,053.60 = 399,479.64/x
  3. Step 3: Cross multiply
    721,788.77x = 996,053.60 × 399,479.64
  4. Step 4: Simplify right side
    721,788.77x = 397,903,131,551.31
  5. Step 5: Solve for x
    x = 397,903,131,551.31/721,788.77
  6. Step 6: Final answer
    x = 551,273.66

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Double scale
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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.