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Finding the Fourth Proportional to 81,248.76, 121,871.79 and 28,658.70

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Solution

The fourth proportional to 81,248.76, 121,871.79 and 28,658.70 is: 42,987.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,248.76 : 121,871.79 = 28,658.70 : x
  2. Step 2: Convert to fraction form
    81,248.76/121,871.79 = 28,658.70/x
  3. Step 3: Cross multiply
    81,248.76x = 121,871.79 × 28,658.70
  4. Step 4: Simplify right side
    81,248.76x = 3,492,687,068.07
  5. Step 5: Solve for x
    x = 3,492,687,068.07/81,248.76
  6. Step 6: Final answer
    x = 42,987.57

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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.