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Finding the Fourth Proportional to 255.08, 382.28 and 139.55

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Solution

The fourth proportional to 255.08, 382.28 and 139.55 is: 209.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.08 : 382.28 = 139.55 : x
  2. Step 2: Convert to fraction form
    255.08/382.28 = 139.55/x
  3. Step 3: Cross multiply
    255.08x = 382.28 × 139.55
  4. Step 4: Simplify right side
    255.08x = 53,347.43
  5. Step 5: Solve for x
    x = 53,347.43/255.08
  6. Step 6: Final answer
    x = 209.14

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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.