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Finding the Fourth Proportional to 109.30, 150.60 and 91.75

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Solution

The fourth proportional to 109.30, 150.60 and 91.75 is: 126.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.30 : 150.60 = 91.75 : x
  2. Step 2: Convert to fraction form
    109.30/150.60 = 91.75/x
  3. Step 3: Cross multiply
    109.30x = 150.60 × 91.75
  4. Step 4: Simplify right side
    109.30x = 13,817.55
  5. Step 5: Solve for x
    x = 13,817.55/109.30
  6. Step 6: Final answer
    x = 126.42

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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.