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Finding the Fourth Proportional to 721,632.43, 995,842.92 and 399,322.90

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Solution

The fourth proportional to 721,632.43, 995,842.92 and 399,322.90 is: 551,060.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,632.43 : 995,842.92 = 399,322.90 : x
  2. Step 2: Convert to fraction form
    721,632.43/995,842.92 = 399,322.90/x
  3. Step 3: Cross multiply
    721,632.43x = 995,842.92 × 399,322.90
  4. Step 4: Simplify right side
    721,632.43x = 397,662,882,758.87
  5. Step 5: Solve for x
    x = 397,662,882,758.87/721,632.43
  6. Step 6: Final answer
    x = 551,060.16

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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.