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Finding the Fourth Proportional to 102.50, 141.34 and 87.00

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Solution

The fourth proportional to 102.50, 141.34 and 87.00 is: 119.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.50 : 141.34 = 87.00 : x
  2. Step 2: Convert to fraction form
    102.50/141.34 = 87.00/x
  3. Step 3: Cross multiply
    102.50x = 141.34 × 87.00
  4. Step 4: Simplify right side
    102.50x = 12,296.09
  5. Step 5: Solve for x
    x = 12,296.09/102.50
  6. Step 6: Final answer
    x = 119.97

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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.