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Finding the Fourth Proportional to 104.64, 144.40 and 71.88

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Solution

The fourth proportional to 104.64, 144.40 and 71.88 is: 99.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.64 : 144.40 = 71.88 : x
  2. Step 2: Convert to fraction form
    104.64/144.40 = 71.88/x
  3. Step 3: Cross multiply
    104.64x = 144.40 × 71.88
  4. Step 4: Simplify right side
    104.64x = 10,379.47
  5. Step 5: Solve for x
    x = 10,379.47/104.64
  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.