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Finding the Fourth Proportional to 91,251.20, 136,876.80 and 81,420.80

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Solution

The fourth proportional to 91,251.20, 136,876.80 and 81,420.80 is: 122,131.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,251.20 : 136,876.80 = 81,420.80 : x
  2. Step 2: Convert to fraction form
    91,251.20/136,876.80 = 81,420.80/x
  3. Step 3: Cross multiply
    91,251.20x = 136,876.80 × 81,420.80
  4. Step 4: Simplify right side
    91,251.20x = 11,144,618,557.44
  5. Step 5: Solve for x
    x = 11,144,618,557.44/91,251.20
  6. Step 6: Final answer
    x = 122,131.20

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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.