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Finding the Fourth Proportional to 100.10, 149.85 and 91.40

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Solution

The fourth proportional to 100.10, 149.85 and 91.40 is: 136.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.10 : 149.85 = 91.40 : x
  2. Step 2: Convert to fraction form
    100.10/149.85 = 91.40/x
  3. Step 3: Cross multiply
    100.10x = 149.85 × 91.40
  4. Step 4: Simplify right side
    100.10x = 13,695.54
  5. Step 5: Solve for x
    x = 13,695.54/100.10
  6. Step 6: Final answer
    x = 136.82

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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.