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Finding the Fourth Proportional to 110.75, 152.80 and 66.47

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Solution

The fourth proportional to 110.75, 152.80 and 66.47 is: 91.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.75 : 152.80 = 66.47 : x
  2. Step 2: Convert to fraction form
    110.75/152.80 = 66.47/x
  3. Step 3: Cross multiply
    110.75x = 152.80 × 66.47
  4. Step 4: Simplify right side
    110.75x = 10,157.13
  5. Step 5: Solve for x
    x = 10,157.13/110.75
  6. Step 6: Final answer
    x = 91.71

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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.