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Finding the Fourth Proportional to 109.76, 151.08 and 101.66

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Solution

The fourth proportional to 109.76, 151.08 and 101.66 is: 139.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.76 : 151.08 = 101.66 : x
  2. Step 2: Convert to fraction form
    109.76/151.08 = 101.66/x
  3. Step 3: Cross multiply
    109.76x = 151.08 × 101.66
  4. Step 4: Simplify right side
    109.76x = 15,358.79
  5. Step 5: Solve for x
    x = 15,358.79/109.76
  6. Step 6: Final answer
    x = 139.93

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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.