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Finding the Fourth Proportional to 80,470.40, 120,628.80 and 62,691.20

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Solution

The fourth proportional to 80,470.40, 120,628.80 and 62,691.20 is: 93,976.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,470.40 : 120,628.80 = 62,691.20 : x
  2. Step 2: Convert to fraction form
    80,470.40/120,628.80 = 62,691.20/x
  3. Step 3: Cross multiply
    80,470.40x = 120,628.80 × 62,691.20
  4. Step 4: Simplify right side
    80,470.40x = 7,562,364,226.56
  5. Step 5: Solve for x
    x = 7,562,364,226.56/80,470.40
  6. Step 6: Final answer
    x = 93,976.97

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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.