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Finding the Fourth Proportional to 100.84, 151.80 and 87.61

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Solution

The fourth proportional to 100.84, 151.80 and 87.61 is: 131.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.84 : 151.80 = 87.61 : x
  2. Step 2: Convert to fraction form
    100.84/151.80 = 87.61/x
  3. Step 3: Cross multiply
    100.84x = 151.80 × 87.61
  4. Step 4: Simplify right side
    100.84x = 13,299.20
  5. Step 5: Solve for x
    x = 13,299.20/100.84
  6. Step 6: Final answer
    x = 131.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.