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Finding the Fourth Proportional to 100.31, 151.05 and 87.62

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Solution

The fourth proportional to 100.31, 151.05 and 87.62 is: 131.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.31 : 151.05 = 87.62 : x
  2. Step 2: Convert to fraction form
    100.31/151.05 = 87.62/x
  3. Step 3: Cross multiply
    100.31x = 151.05 × 87.62
  4. Step 4: Simplify right side
    100.31x = 13,235.00
  5. Step 5: Solve for x
    x = 13,235.00/100.31
  6. Step 6: Final answer
    x = 131.94

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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.