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Finding the Fourth Proportional to 87.57, 120.87 and 70.11

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Solution

The fourth proportional to 87.57, 120.87 and 70.11 is: 96.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.57 : 120.87 = 70.11 : x
  2. Step 2: Convert to fraction form
    87.57/120.87 = 70.11/x
  3. Step 3: Cross multiply
    87.57x = 120.87 × 70.11
  4. Step 4: Simplify right side
    87.57x = 8,474.20
  5. Step 5: Solve for x
    x = 8,474.20/87.57
  6. Step 6: Final answer
    x = 96.77

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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.