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Finding the Fourth Proportional to 721,751.28, 995,975.46 and 399,442.20

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Solution

The fourth proportional to 721,751.28, 995,975.46 and 399,442.20 is: 551,207.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,751.28 : 995,975.46 = 399,442.20 : x
  2. Step 2: Convert to fraction form
    721,751.28/995,975.46 = 399,442.20/x
  3. Step 3: Cross multiply
    721,751.28x = 995,975.46 × 399,442.20
  4. Step 4: Simplify right side
    721,751.28x = 397,834,628,888.41
  5. Step 5: Solve for x
    x = 397,834,628,888.41/721,751.28
  6. Step 6: Final answer
    x = 551,207.38

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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.