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Finding the Fourth Proportional to 254.90, 382.05 and 139.38

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Solution

The fourth proportional to 254.90, 382.05 and 139.38 is: 208.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.90 : 382.05 = 139.38 : x
  2. Step 2: Convert to fraction form
    254.90/382.05 = 139.38/x
  3. Step 3: Cross multiply
    254.90x = 382.05 × 139.38
  4. Step 4: Simplify right side
    254.90x = 53,250.13
  5. Step 5: Solve for x
    x = 53,250.13/254.90
  6. Step 6: Final answer
    x = 208.91

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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.