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Finding the Fourth Proportional to 255.18, 382.65 and 139.59

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Solution

The fourth proportional to 255.18, 382.65 and 139.59 is: 209.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.18 : 382.65 = 139.59 : x
  2. Step 2: Convert to fraction form
    255.18/382.65 = 139.59/x
  3. Step 3: Cross multiply
    255.18x = 382.65 × 139.59
  4. Step 4: Simplify right side
    255.18x = 53,414.11
  5. Step 5: Solve for x
    x = 53,414.11/255.18
  6. Step 6: Final answer
    x = 209.32

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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.