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Finding the Fourth Proportional to 254.99, 382.52 and 81.65

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Solution

The fourth proportional to 254.99, 382.52 and 81.65 is: 122.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.99 : 382.52 = 81.65 : x
  2. Step 2: Convert to fraction form
    254.99/382.52 = 81.65/x
  3. Step 3: Cross multiply
    254.99x = 382.52 × 81.65
  4. Step 4: Simplify right side
    254.99x = 31,232.35
  5. Step 5: Solve for x
    x = 31,232.35/254.99
  6. Step 6: Final answer
    x = 122.48

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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.