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Finding the Fourth Proportional to 102.51, 141.39 and 69.75

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Solution

The fourth proportional to 102.51, 141.39 and 69.75 is: 96.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.51 : 141.39 = 69.75 : x
  2. Step 2: Convert to fraction form
    102.51/141.39 = 69.75/x
  3. Step 3: Cross multiply
    102.51x = 141.39 × 69.75
  4. Step 4: Simplify right side
    102.51x = 9,861.95
  5. Step 5: Solve for x
    x = 9,861.95/102.51
  6. Step 6: Final answer
    x = 96.20

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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.