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Finding the Fourth Proportional to 919.42, 1,375.68 and 547.86

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Solution

The fourth proportional to 919.42, 1,375.68 and 547.86 is: 819.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.42 : 1,375.68 = 547.86 : x
  2. Step 2: Convert to fraction form
    919.42/1,375.68 = 547.86/x
  3. Step 3: Cross multiply
    919.42x = 1,375.68 × 547.86
  4. Step 4: Simplify right side
    919.42x = 753,680.04
  5. Step 5: Solve for x
    x = 753,680.04/919.42
  6. Step 6: Final answer
    x = 819.73

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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.