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Finding the Fourth Proportional to 100.87, 150.91 and 87.49

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Solution

The fourth proportional to 100.87, 150.91 and 87.49 is: 130.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.87 : 150.91 = 87.49 : x
  2. Step 2: Convert to fraction form
    100.87/150.91 = 87.49/x
  3. Step 3: Cross multiply
    100.87x = 150.91 × 87.49
  4. Step 4: Simplify right side
    100.87x = 13,203.12
  5. Step 5: Solve for x
    x = 13,203.12/100.87
  6. Step 6: Final answer
    x = 130.89

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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.