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Finding the Fourth Proportional to 254.95, 382.23 and 81.51

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Solution

The fourth proportional to 254.95, 382.23 and 81.51 is: 122.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.95 : 382.23 = 81.51 : x
  2. Step 2: Convert to fraction form
    254.95/382.23 = 81.51/x
  3. Step 3: Cross multiply
    254.95x = 382.23 × 81.51
  4. Step 4: Simplify right side
    254.95x = 31,157.20
  5. Step 5: Solve for x
    x = 31,157.20/254.95
  6. Step 6: Final answer
    x = 122.21

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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.