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Finding the Fourth Proportional to 77.47, 116.22 and 74.72

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Solution

The fourth proportional to 77.47, 116.22 and 74.72 is: 112.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.47 : 116.22 = 74.72 : x
  2. Step 2: Convert to fraction form
    77.47/116.22 = 74.72/x
  3. Step 3: Cross multiply
    77.47x = 116.22 × 74.72
  4. Step 4: Simplify right side
    77.47x = 8,683.96
  5. Step 5: Solve for x
    x = 8,683.96/77.47
  6. Step 6: Final answer
    x = 112.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.