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Finding the Fourth Proportional to 109.61, 151.29 and 91.38

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Solution

The fourth proportional to 109.61, 151.29 and 91.38 is: 126.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.61 : 151.29 = 91.38 : x
  2. Step 2: Convert to fraction form
    109.61/151.29 = 91.38/x
  3. Step 3: Cross multiply
    109.61x = 151.29 × 91.38
  4. Step 4: Simplify right side
    109.61x = 13,824.88
  5. Step 5: Solve for x
    x = 13,824.88/109.61
  6. Step 6: Final answer
    x = 126.13

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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.