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Finding the Fourth Proportional to 104.90, 144.78 and 63.49

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Solution

The fourth proportional to 104.90, 144.78 and 63.49 is: 87.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.90 : 144.78 = 63.49 : x
  2. Step 2: Convert to fraction form
    104.90/144.78 = 63.49/x
  3. Step 3: Cross multiply
    104.90x = 144.78 × 63.49
  4. Step 4: Simplify right side
    104.90x = 9,192.08
  5. Step 5: Solve for x
    x = 9,192.08/104.90
  6. Step 6: Final answer
    x = 87.63

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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.