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Finding the Fourth Proportional to 721,516.72, 995,694.24 and 399,240.40

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Solution

The fourth proportional to 721,516.72, 995,694.24 and 399,240.40 is: 550,952.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,516.72 : 995,694.24 = 399,240.40 : x
  2. Step 2: Convert to fraction form
    721,516.72/995,694.24 = 399,240.40/x
  3. Step 3: Cross multiply
    721,516.72x = 995,694.24 × 399,240.40
  4. Step 4: Simplify right side
    721,516.72x = 397,521,366,655.30
  5. Step 5: Solve for x
    x = 397,521,366,655.30/721,516.72
  6. Step 6: Final answer
    x = 550,952.40

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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.