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Finding the Fourth Proportional to 80.68, 111.12 and 56.08

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Solution

The fourth proportional to 80.68, 111.12 and 56.08 is: 77.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.68 : 111.12 = 56.08 : x
  2. Step 2: Convert to fraction form
    80.68/111.12 = 56.08/x
  3. Step 3: Cross multiply
    80.68x = 111.12 × 56.08
  4. Step 4: Simplify right side
    80.68x = 6,231.61
  5. Step 5: Solve for x
    x = 6,231.61/80.68
  6. Step 6: Final answer
    x = 77.24

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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.