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Finding the Fourth Proportional to 111.71, 154.16 and 76.74

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Solution

The fourth proportional to 111.71, 154.16 and 76.74 is: 105.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.71 : 154.16 = 76.74 : x
  2. Step 2: Convert to fraction form
    111.71/154.16 = 76.74/x
  3. Step 3: Cross multiply
    111.71x = 154.16 × 76.74
  4. Step 4: Simplify right side
    111.71x = 11,829.85
  5. Step 5: Solve for x
    x = 11,829.85/111.71
  6. Step 6: Final answer
    x = 105.90

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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.