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Finding the Fourth Proportional to 865,712.80, 1,298,569.20 and 487,799.20

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Solution

The fourth proportional to 865,712.80, 1,298,569.20 and 487,799.20 is: 731,698.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,712.80 : 1,298,569.20 = 487,799.20 : x
  2. Step 2: Convert to fraction form
    865,712.80/1,298,569.20 = 487,799.20/x
  3. Step 3: Cross multiply
    865,712.80x = 1,298,569.20 × 487,799.20
  4. Step 4: Simplify right side
    865,712.80x = 633,441,016,904.64
  5. Step 5: Solve for x
    x = 633,441,016,904.64/865,712.80
  6. Step 6: Final answer
    x = 731,698.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.