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Finding the Fourth Proportional to 82.70, 114.11 and 51.61

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Solution

The fourth proportional to 82.70, 114.11 and 51.61 is: 71.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.70 : 114.11 = 51.61 : x
  2. Step 2: Convert to fraction form
    82.70/114.11 = 51.61/x
  3. Step 3: Cross multiply
    82.70x = 114.11 × 51.61
  4. Step 4: Simplify right side
    82.70x = 5,889.38
  5. Step 5: Solve for x
    x = 5,889.38/82.70
  6. Step 6: Final answer
    x = 71.21

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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.