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Finding the Fourth Proportional to 255.75, 383.49 and 139.98

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Solution

The fourth proportional to 255.75, 383.49 and 139.98 is: 209.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.75 : 383.49 = 139.98 : x
  2. Step 2: Convert to fraction form
    255.75/383.49 = 139.98/x
  3. Step 3: Cross multiply
    255.75x = 383.49 × 139.98
  4. Step 4: Simplify right side
    255.75x = 53,680.93
  5. Step 5: Solve for x
    x = 53,680.93/255.75
  6. Step 6: Final answer
    x = 209.90

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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.