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Finding the Fourth Proportional to 80.77, 121.11 and 29.40

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Solution

The fourth proportional to 80.77, 121.11 and 29.40 is: 44.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.77 : 121.11 = 29.40 : x
  2. Step 2: Convert to fraction form
    80.77/121.11 = 29.40/x
  3. Step 3: Cross multiply
    80.77x = 121.11 × 29.40
  4. Step 4: Simplify right side
    80.77x = 3,560.63
  5. Step 5: Solve for x
    x = 3,560.63/80.77
  6. Step 6: Final answer
    x = 44.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.