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Finding the Fourth Proportional to 721,658.06, 995,863.43 and 399,381.74

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Solution

The fourth proportional to 721,658.06, 995,863.43 and 399,381.74 is: 551,133.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,658.06 : 995,863.43 = 399,381.74 : x
  2. Step 2: Convert to fraction form
    721,658.06/995,863.43 = 399,381.74/x
  3. Step 3: Cross multiply
    721,658.06x = 995,863.43 × 399,381.74
  4. Step 4: Simplify right side
    721,658.06x = 397,729,662,499.54
  5. Step 5: Solve for x
    x = 397,729,662,499.54/721,658.06
  6. Step 6: Final answer
    x = 551,133.13

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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.