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Finding the Fourth Proportional to 80, 110.40 and 45.50

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Solution

The fourth proportional to 80, 110.40 and 45.50 is: 62.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    80 : 110.40 = 45.50 : x
  2. Step 2: Convert to fraction form
    80/110.40 = 45.50/x
  3. Step 3: Cross multiply
    80x = 110.40 × 45.50
  4. Step 4: Simplify right side
    80x = 5,023.20
  5. Step 5: Solve for x
    x = 5,023.20/80
  6. Step 6: Final answer
    x = 62.79

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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.