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Finding the Fourth Proportional to 109.75, 151.34 and 66.08

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Solution

The fourth proportional to 109.75, 151.34 and 66.08 is: 91.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.75 : 151.34 = 66.08 : x
  2. Step 2: Convert to fraction form
    109.75/151.34 = 66.08/x
  3. Step 3: Cross multiply
    109.75x = 151.34 × 66.08
  4. Step 4: Simplify right side
    109.75x = 10,000.55
  5. Step 5: Solve for x
    x = 10,000.55/109.75
  6. Step 6: Final answer
    x = 91.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.