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Finding the Fourth Proportional to 721,332, 995,467.47 and 399,036.54

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Solution

The fourth proportional to 721,332, 995,467.47 and 399,036.54 is: 550,686.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,332 : 995,467.47 = 399,036.54 : x
  2. Step 2: Convert to fraction form
    721,332/995,467.47 = 399,036.54/x
  3. Step 3: Cross multiply
    721,332x = 995,467.47 × 399,036.54
  4. Step 4: Simplify right side
    721,332x = 397,227,894,911.35
  5. Step 5: Solve for x
    x = 397,227,894,911.35/721,332
  6. Step 6: Final answer
    x = 550,686.64

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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.