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Finding the Fourth Proportional to 104.40, 144.16 and 79.76

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Solution

The fourth proportional to 104.40, 144.16 and 79.76 is: 110.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.40 : 144.16 = 79.76 : x
  2. Step 2: Convert to fraction form
    104.40/144.16 = 79.76/x
  3. Step 3: Cross multiply
    104.40x = 144.16 × 79.76
  4. Step 4: Simplify right side
    104.40x = 11,498.20
  5. Step 5: Solve for x
    x = 11,498.20/104.40
  6. Step 6: Final answer
    x = 110.14

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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.