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Finding the Fourth Proportional to 721,516.10, 995,693.38 and 399,239.78

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Solution

The fourth proportional to 721,516.10, 995,693.38 and 399,239.78 is: 550,951.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,516.10 : 995,693.38 = 399,239.78 : x
  2. Step 2: Convert to fraction form
    721,516.10/995,693.38 = 399,239.78/x
  3. Step 3: Cross multiply
    721,516.10x = 995,693.38 × 399,239.78
  4. Step 4: Simplify right side
    721,516.10x = 397,520,400,002.09
  5. Step 5: Solve for x
    x = 397,520,400,002.09/721,516.10
  6. Step 6: Final answer
    x = 550,951.53

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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.