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Finding the Fourth Proportional to 87.63, 120.91 and 58.50

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Solution

The fourth proportional to 87.63, 120.91 and 58.50 is: 80.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.63 : 120.91 = 58.50 : x
  2. Step 2: Convert to fraction form
    87.63/120.91 = 58.50/x
  3. Step 3: Cross multiply
    87.63x = 120.91 × 58.50
  4. Step 4: Simplify right side
    87.63x = 7,073.24
  5. Step 5: Solve for x
    x = 7,073.24/87.63
  6. Step 6: Final answer
    x = 80.72

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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.