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Finding the Fourth Proportional to 104.58, 144.32 and 71.88

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Solution

The fourth proportional to 104.58, 144.32 and 71.88 is: 99.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.58 : 144.32 = 71.88 : x
  2. Step 2: Convert to fraction form
    104.58/144.32 = 71.88/x
  3. Step 3: Cross multiply
    104.58x = 144.32 × 71.88
  4. Step 4: Simplify right side
    104.58x = 10,373.72
  5. Step 5: Solve for x
    x = 10,373.72/104.58
  6. Step 6: Final answer
    x = 99.19

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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.