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Finding the Fourth Proportional to 102.81, 141.68 and 70.11

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Solution

The fourth proportional to 102.81, 141.68 and 70.11 is: 96.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.81 : 141.68 = 70.11 : x
  2. Step 2: Convert to fraction form
    102.81/141.68 = 70.11/x
  3. Step 3: Cross multiply
    102.81x = 141.68 × 70.11
  4. Step 4: Simplify right side
    102.81x = 9,932.83
  5. Step 5: Solve for x
    x = 9,932.83/102.81
  6. Step 6: Final answer
    x = 96.61

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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.