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Finding the Fourth Proportional to 721,643.39, 995,869.82 and 399,375.71

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Solution

The fourth proportional to 721,643.39, 995,869.82 and 399,375.71 is: 551,139.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,643.39 : 995,869.82 = 399,375.71 : x
  2. Step 2: Convert to fraction form
    721,643.39/995,869.82 = 399,375.71/x
  3. Step 3: Cross multiply
    721,643.39x = 995,869.82 × 399,375.71
  4. Step 4: Simplify right side
    721,643.39x = 397,726,216,430.07
  5. Step 5: Solve for x
    x = 397,726,216,430.07/721,643.39
  6. Step 6: Final answer
    x = 551,139.55

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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.