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Finding the Fourth Proportional to 81,079.29, 121,674.30 and 28,488.78

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Solution

The fourth proportional to 81,079.29, 121,674.30 and 28,488.78 is: 42,752.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,079.29 : 121,674.30 = 28,488.78 : x
  2. Step 2: Convert to fraction form
    81,079.29/121,674.30 = 28,488.78/x
  3. Step 3: Cross multiply
    81,079.29x = 121,674.30 × 28,488.78
  4. Step 4: Simplify right side
    81,079.29x = 3,466,352,257.52
  5. Step 5: Solve for x
    x = 3,466,352,257.52/81,079.29
  6. Step 6: Final answer
    x = 42,752.62

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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.