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Finding the Fourth Proportional to 927,686.80, 1,388,419.80 and 815,712.40

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Solution

The fourth proportional to 927,686.80, 1,388,419.80 and 815,712.40 is: 1,220,833.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    927,686.80 : 1,388,419.80 = 815,712.40 : x
  2. Step 2: Convert to fraction form
    927,686.80/1,388,419.80 = 815,712.40/x
  3. Step 3: Cross multiply
    927,686.80x = 1,388,419.80 × 815,712.40
  4. Step 4: Simplify right side
    927,686.80x = 1,132,551,247,265.52
  5. Step 5: Solve for x
    x = 1,132,551,247,265.52/927,686.80
  6. Step 6: Final answer
    x = 1,220,833.63

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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.