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Finding the Fourth Proportional to 80.04, 110.60 and 61.78

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Solution

The fourth proportional to 80.04, 110.60 and 61.78 is: 85.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.04 : 110.60 = 61.78 : x
  2. Step 2: Convert to fraction form
    80.04/110.60 = 61.78/x
  3. Step 3: Cross multiply
    80.04x = 110.60 × 61.78
  4. Step 4: Simplify right side
    80.04x = 6,832.71
  5. Step 5: Solve for x
    x = 6,832.71/80.04
  6. Step 6: Final answer
    x = 85.36

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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.