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Finding the Fourth Proportional to 102.60, 141.60 and 61.15

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Solution

The fourth proportional to 102.60, 141.60 and 61.15 is: 84.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.60 : 141.60 = 61.15 : x
  2. Step 2: Convert to fraction form
    102.60/141.60 = 61.15/x
  3. Step 3: Cross multiply
    102.60x = 141.60 × 61.15
  4. Step 4: Simplify right side
    102.60x = 8,659.02
  5. Step 5: Solve for x
    x = 8,659.02/102.60
  6. Step 6: Final answer
    x = 84.39

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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.