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Finding the Fourth Proportional to 87.54, 120.81 and 48.21

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Solution

The fourth proportional to 87.54, 120.81 and 48.21 is: 66.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.54 : 120.81 = 48.21 : x
  2. Step 2: Convert to fraction form
    87.54/120.81 = 48.21/x
  3. Step 3: Cross multiply
    87.54x = 120.81 × 48.21
  4. Step 4: Simplify right side
    87.54x = 5,823.98
  5. Step 5: Solve for x
    x = 5,823.98/87.54
  6. Step 6: Final answer
    x = 66.53

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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.