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Finding the Fourth Proportional to 752.94, 1,128.60 and 427.86

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Solution

The fourth proportional to 752.94, 1,128.60 and 427.86 is: 641.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.94 : 1,128.60 = 427.86 : x
  2. Step 2: Convert to fraction form
    752.94/1,128.60 = 427.86/x
  3. Step 3: Cross multiply
    752.94x = 1,128.60 × 427.86
  4. Step 4: Simplify right side
    752.94x = 482,882.80
  5. Step 5: Solve for x
    x = 482,882.80/752.94
  6. Step 6: Final answer
    x = 641.33

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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.