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Finding the Fourth Proportional to 254.32, 381.42 and 80.98

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Solution

The fourth proportional to 254.32, 381.42 and 80.98 is: 121.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.32 : 381.42 = 80.98 : x
  2. Step 2: Convert to fraction form
    254.32/381.42 = 80.98/x
  3. Step 3: Cross multiply
    254.32x = 381.42 × 80.98
  4. Step 4: Simplify right side
    254.32x = 30,886.44
  5. Step 5: Solve for x
    x = 30,886.44/254.32
  6. Step 6: Final answer
    x = 121.45

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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.