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Finding the Fourth Proportional to 205.40, 283.47 and 139.86

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Solution

The fourth proportional to 205.40, 283.47 and 139.86 is: 193.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.40 : 283.47 = 139.86 : x
  2. Step 2: Convert to fraction form
    205.40/283.47 = 139.86/x
  3. Step 3: Cross multiply
    205.40x = 283.47 × 139.86
  4. Step 4: Simplify right side
    205.40x = 39,645.59
  5. Step 5: Solve for x
    x = 39,645.59/205.40
  6. Step 6: Final answer
    x = 193.01

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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.