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Finding the Fourth Proportional to 109.14, 150.67 and 76.57

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Solution

The fourth proportional to 109.14, 150.67 and 76.57 is: 105.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.14 : 150.67 = 76.57 : x
  2. Step 2: Convert to fraction form
    109.14/150.67 = 76.57/x
  3. Step 3: Cross multiply
    109.14x = 150.67 × 76.57
  4. Step 4: Simplify right side
    109.14x = 11,535.86
  5. Step 5: Solve for x
    x = 11,535.86/109.14
  6. Step 6: Final answer
    x = 105.70

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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.