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Finding the Fourth Proportional to 87.24, 120.30 and 65.37

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Solution

The fourth proportional to 87.24, 120.30 and 65.37 is: 90.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.24 : 120.30 = 65.37 : x
  2. Step 2: Convert to fraction form
    87.24/120.30 = 65.37/x
  3. Step 3: Cross multiply
    87.24x = 120.30 × 65.37
  4. Step 4: Simplify right side
    87.24x = 7,864.01
  5. Step 5: Solve for x
    x = 7,864.01/87.24
  6. Step 6: Final answer
    x = 90.14

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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.