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Finding the Fourth Proportional to 120.80, 166.74 and 88.10

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Solution

The fourth proportional to 120.80, 166.74 and 88.10 is: 121.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.80 : 166.74 = 88.10 : x
  2. Step 2: Convert to fraction form
    120.80/166.74 = 88.10/x
  3. Step 3: Cross multiply
    120.80x = 166.74 × 88.10
  4. Step 4: Simplify right side
    120.80x = 14,689.79
  5. Step 5: Solve for x
    x = 14,689.79/120.80
  6. Step 6: Final answer
    x = 121.60

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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.