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Finding the Fourth Proportional to 721,662.32, 995,869.28 and 399,386

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Solution

The fourth proportional to 721,662.32, 995,869.28 and 399,386 is: 551,139.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,662.32 : 995,869.28 = 399,386 : x
  2. Step 2: Convert to fraction form
    721,662.32/995,869.28 = 399,386/x
  3. Step 3: Cross multiply
    721,662.32x = 995,869.28 × 399,386
  4. Step 4: Simplify right side
    721,662.32x = 397,736,248,262.08
  5. Step 5: Solve for x
    x = 397,736,248,262.08/721,662.32
  6. Step 6: Final answer
    x = 551,139.00

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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.