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Finding the Fourth Proportional to 205.61, 283.86 and 140.21

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Solution

The fourth proportional to 205.61, 283.86 and 140.21 is: 193.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.61 : 283.86 = 140.21 : x
  2. Step 2: Convert to fraction form
    205.61/283.86 = 140.21/x
  3. Step 3: Cross multiply
    205.61x = 283.86 × 140.21
  4. Step 4: Simplify right side
    205.61x = 39,800.01
  5. Step 5: Solve for x
    x = 39,800.01/205.61
  6. Step 6: Final answer
    x = 193.57

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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.