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Finding the Fourth Proportional to 254.74, 381.99 and 90.17

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Solution

The fourth proportional to 254.74, 381.99 and 90.17 is: 135.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.74 : 381.99 = 90.17 : x
  2. Step 2: Convert to fraction form
    254.74/381.99 = 90.17/x
  3. Step 3: Cross multiply
    254.74x = 381.99 × 90.17
  4. Step 4: Simplify right side
    254.74x = 34,444.04
  5. Step 5: Solve for x
    x = 34,444.04/254.74
  6. Step 6: Final answer
    x = 135.21

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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.