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Finding the Fourth Proportional to 100.64, 149.85 and 99.18

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Solution

The fourth proportional to 100.64, 149.85 and 99.18 is: 147.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.64 : 149.85 = 99.18 : x
  2. Step 2: Convert to fraction form
    100.64/149.85 = 99.18/x
  3. Step 3: Cross multiply
    100.64x = 149.85 × 99.18
  4. Step 4: Simplify right side
    100.64x = 14,862.12
  5. Step 5: Solve for x
    x = 14,862.12/100.64
  6. Step 6: Final answer
    x = 147.68

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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.