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Finding the Fourth Proportional to 104.78, 144.66 and 77.18

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Solution

The fourth proportional to 104.78, 144.66 and 77.18 is: 106.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.78 : 144.66 = 77.18 : x
  2. Step 2: Convert to fraction form
    104.78/144.66 = 77.18/x
  3. Step 3: Cross multiply
    104.78x = 144.66 × 77.18
  4. Step 4: Simplify right side
    104.78x = 11,164.14
  5. Step 5: Solve for x
    x = 11,164.14/104.78
  6. Step 6: Final answer
    x = 106.55

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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.