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Finding the Fourth Proportional to 80.03, 110.46 and 61.65

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Solution

The fourth proportional to 80.03, 110.46 and 61.65 is: 85.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.03 : 110.46 = 61.65 : x
  2. Step 2: Convert to fraction form
    80.03/110.46 = 61.65/x
  3. Step 3: Cross multiply
    80.03x = 110.46 × 61.65
  4. Step 4: Simplify right side
    80.03x = 6,809.86
  5. Step 5: Solve for x
    x = 6,809.86/80.03
  6. Step 6: Final answer
    x = 85.10

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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.