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Finding the Fourth Proportional to 254.10, 381.12 and 91.74

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Solution

The fourth proportional to 254.10, 381.12 and 91.74 is: 137.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.10 : 381.12 = 91.74 : x
  2. Step 2: Convert to fraction form
    254.10/381.12 = 91.74/x
  3. Step 3: Cross multiply
    254.10x = 381.12 × 91.74
  4. Step 4: Simplify right side
    254.10x = 34,963.95
  5. Step 5: Solve for x
    x = 34,963.95/254.10
  6. Step 6: Final answer
    x = 137.60

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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.