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Finding the Fourth Proportional to 100.49, 150.57 and 87.40

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Solution

The fourth proportional to 100.49, 150.57 and 87.40 is: 130.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.49 : 150.57 = 87.40 : x
  2. Step 2: Convert to fraction form
    100.49/150.57 = 87.40/x
  3. Step 3: Cross multiply
    100.49x = 150.57 × 87.40
  4. Step 4: Simplify right side
    100.49x = 13,160.01
  5. Step 5: Solve for x
    x = 13,160.01/100.49
  6. Step 6: Final answer
    x = 130.96

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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.