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Finding the Fourth Proportional to 254.94, 382.40 and 81.60

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Solution

The fourth proportional to 254.94, 382.40 and 81.60 is: 122.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.94 : 382.40 = 81.60 : x
  2. Step 2: Convert to fraction form
    254.94/382.40 = 81.60/x
  3. Step 3: Cross multiply
    254.94x = 382.40 × 81.60
  4. Step 4: Simplify right side
    254.94x = 31,203.84
  5. Step 5: Solve for x
    x = 31,203.84/254.94
  6. Step 6: Final answer
    x = 122.40

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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.