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Finding the Fourth Proportional to 100.52, 149.90 and 99.61

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Solution

The fourth proportional to 100.52, 149.90 and 99.61 is: 148.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.52 : 149.90 = 99.61 : x
  2. Step 2: Convert to fraction form
    100.52/149.90 = 99.61/x
  3. Step 3: Cross multiply
    100.52x = 149.90 × 99.61
  4. Step 4: Simplify right side
    100.52x = 14,931.54
  5. Step 5: Solve for x
    x = 14,931.54/100.52
  6. Step 6: Final answer
    x = 148.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.