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Finding the Fourth Proportional to 205.38, 283.59 and 139.86

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Solution

The fourth proportional to 205.38, 283.59 and 139.86 is: 193.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.38 : 283.59 = 139.86 : x
  2. Step 2: Convert to fraction form
    205.38/283.59 = 139.86/x
  3. Step 3: Cross multiply
    205.38x = 283.59 × 139.86
  4. Step 4: Simplify right side
    205.38x = 39,662.90
  5. Step 5: Solve for x
    x = 39,662.90/205.38
  6. Step 6: Final answer
    x = 193.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.