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Finding the Fourth Proportional to 255.15, 382.57 and 139.30

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Solution

The fourth proportional to 255.15, 382.57 and 139.30 is: 208.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.15 : 382.57 = 139.30 : x
  2. Step 2: Convert to fraction form
    255.15/382.57 = 139.30/x
  3. Step 3: Cross multiply
    255.15x = 382.57 × 139.30
  4. Step 4: Simplify right side
    255.15x = 53,290.70
  5. Step 5: Solve for x
    x = 53,290.70/255.15
  6. Step 6: Final answer
    x = 208.86

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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.