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Finding the Fourth Proportional to 109.39, 150.85 and 91.16

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Solution

The fourth proportional to 109.39, 150.85 and 91.16 is: 125.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.39 : 150.85 = 91.16 : x
  2. Step 2: Convert to fraction form
    109.39/150.85 = 91.16/x
  3. Step 3: Cross multiply
    109.39x = 150.85 × 91.16
  4. Step 4: Simplify right side
    109.39x = 13,751.49
  5. Step 5: Solve for x
    x = 13,751.49/109.39
  6. Step 6: Final answer
    x = 125.71

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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.