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Finding the Fourth Proportional to 102.81, 141.69 and 75.12

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Solution

The fourth proportional to 102.81, 141.69 and 75.12 is: 103.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.81 : 141.69 = 75.12 : x
  2. Step 2: Convert to fraction form
    102.81/141.69 = 75.12/x
  3. Step 3: Cross multiply
    102.81x = 141.69 × 75.12
  4. Step 4: Simplify right side
    102.81x = 10,643.75
  5. Step 5: Solve for x
    x = 10,643.75/102.81
  6. Step 6: Final answer
    x = 103.53

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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.