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Finding the Fourth Proportional to 80.84, 120.50 and 74.76

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Solution

The fourth proportional to 80.84, 120.50 and 74.76 is: 111.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.84 : 120.50 = 74.76 : x
  2. Step 2: Convert to fraction form
    80.84/120.50 = 74.76/x
  3. Step 3: Cross multiply
    80.84x = 120.50 × 74.76
  4. Step 4: Simplify right side
    80.84x = 9,008.58
  5. Step 5: Solve for x
    x = 9,008.58/80.84
  6. Step 6: Final answer
    x = 111.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.