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Finding the Fourth Proportional to 169.78, 254.59 and 66.98

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Solution

The fourth proportional to 169.78, 254.59 and 66.98 is: 100.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.78 : 254.59 = 66.98 : x
  2. Step 2: Convert to fraction form
    169.78/254.59 = 66.98/x
  3. Step 3: Cross multiply
    169.78x = 254.59 × 66.98
  4. Step 4: Simplify right side
    169.78x = 17,052.44
  5. Step 5: Solve for x
    x = 17,052.44/169.78
  6. Step 6: Final answer
    x = 100.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.