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Finding the Fourth Proportional to 104.61, 144.33 and 71.79

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Solution

The fourth proportional to 104.61, 144.33 and 71.79 is: 99.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.61 : 144.33 = 71.79 : x
  2. Step 2: Convert to fraction form
    104.61/144.33 = 71.79/x
  3. Step 3: Cross multiply
    104.61x = 144.33 × 71.79
  4. Step 4: Simplify right side
    104.61x = 10,361.45
  5. Step 5: Solve for x
    x = 10,361.45/104.61
  6. Step 6: Final answer
    x = 99.05

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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.