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Finding the Fourth Proportional to 120.48, 166.21 and 87.66

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Solution

The fourth proportional to 120.48, 166.21 and 87.66 is: 120.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.48 : 166.21 = 87.66 : x
  2. Step 2: Convert to fraction form
    120.48/166.21 = 87.66/x
  3. Step 3: Cross multiply
    120.48x = 166.21 × 87.66
  4. Step 4: Simplify right side
    120.48x = 14,569.97
  5. Step 5: Solve for x
    x = 14,569.97/120.48
  6. Step 6: Final answer
    x = 120.93

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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.