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Finding the Fourth Proportional to 205.80, 284.01 and 112.55

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Solution

The fourth proportional to 205.80, 284.01 and 112.55 is: 155.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.80 : 284.01 = 112.55 : x
  2. Step 2: Convert to fraction form
    205.80/284.01 = 112.55/x
  3. Step 3: Cross multiply
    205.80x = 284.01 × 112.55
  4. Step 4: Simplify right side
    205.80x = 31,965.61
  5. Step 5: Solve for x
    x = 31,965.61/205.80
  6. Step 6: Final answer
    x = 155.32

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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.