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Finding the Fourth Proportional to 76.71, 114.42 and 74.49

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Solution

The fourth proportional to 76.71, 114.42 and 74.49 is: 111.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.71 : 114.42 = 74.49 : x
  2. Step 2: Convert to fraction form
    76.71/114.42 = 74.49/x
  3. Step 3: Cross multiply
    76.71x = 114.42 × 74.49
  4. Step 4: Simplify right side
    76.71x = 8,523.15
  5. Step 5: Solve for x
    x = 8,523.15/76.71
  6. Step 6: Final answer
    x = 111.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.