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Finding the Fourth Proportional to 721,516.60, 995,694.07 and 399,240.28

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Solution

The fourth proportional to 721,516.60, 995,694.07 and 399,240.28 is: 550,952.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,516.60 : 995,694.07 = 399,240.28 : x
  2. Step 2: Convert to fraction form
    721,516.60/995,694.07 = 399,240.28/x
  3. Step 3: Cross multiply
    721,516.60x = 995,694.07 × 399,240.28
  4. Step 4: Simplify right side
    721,516.60x = 397,521,173,324.57
  5. Step 5: Solve for x
    x = 397,521,173,324.57/721,516.60
  6. Step 6: Final answer
    x = 550,952.22

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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.