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Finding the Fourth Proportional to 205.87, 284.10 and 112.61

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Solution

The fourth proportional to 205.87, 284.10 and 112.61 is: 155.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.87 : 284.10 = 112.61 : x
  2. Step 2: Convert to fraction form
    205.87/284.10 = 112.61/x
  3. Step 3: Cross multiply
    205.87x = 284.10 × 112.61
  4. Step 4: Simplify right side
    205.87x = 31,993.21
  5. Step 5: Solve for x
    x = 31,993.21/205.87
  6. Step 6: Final answer
    x = 155.40

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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.