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Finding the Fourth Proportional to 120.49, 166.49 and 87.68

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Solution

The fourth proportional to 120.49, 166.49 and 87.68 is: 121.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.49 : 166.49 = 87.68 : x
  2. Step 2: Convert to fraction form
    120.49/166.49 = 87.68/x
  3. Step 3: Cross multiply
    120.49x = 166.49 × 87.68
  4. Step 4: Simplify right side
    120.49x = 14,598.15
  5. Step 5: Solve for x
    x = 14,598.15/120.49
  6. Step 6: Final answer
    x = 121.16

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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.