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Finding the Fourth Proportional to 80.77, 121.20 and 37.45

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Solution

The fourth proportional to 80.77, 121.20 and 37.45 is: 56.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.77 : 121.20 = 37.45 : x
  2. Step 2: Convert to fraction form
    80.77/121.20 = 37.45/x
  3. Step 3: Cross multiply
    80.77x = 121.20 × 37.45
  4. Step 4: Simplify right side
    80.77x = 4,538.94
  5. Step 5: Solve for x
    x = 4,538.94/80.77
  6. Step 6: Final answer
    x = 56.20

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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.