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Finding the Fourth Proportional to 912.87, 1,367.78 and 425.61

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Solution

The fourth proportional to 912.87, 1,367.78 and 425.61 is: 637.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.87 : 1,367.78 = 425.61 : x
  2. Step 2: Convert to fraction form
    912.87/1,367.78 = 425.61/x
  3. Step 3: Cross multiply
    912.87x = 1,367.78 × 425.61
  4. Step 4: Simplify right side
    912.87x = 582,138.72
  5. Step 5: Solve for x
    x = 582,138.72/912.87
  6. Step 6: Final answer
    x = 637.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.