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Finding the Fourth Proportional to 102.70, 141.76 and 82.07

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Solution

The fourth proportional to 102.70, 141.76 and 82.07 is: 113.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.70 : 141.76 = 82.07 : x
  2. Step 2: Convert to fraction form
    102.70/141.76 = 82.07/x
  3. Step 3: Cross multiply
    102.70x = 141.76 × 82.07
  4. Step 4: Simplify right side
    102.70x = 11,634.24
  5. Step 5: Solve for x
    x = 11,634.24/102.70
  6. Step 6: Final answer
    x = 113.28

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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.