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Finding the Fourth Proportional to 925.72, 1,387.20 and 843.76

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Solution

The fourth proportional to 925.72, 1,387.20 and 843.76 is: 1,264.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.72 : 1,387.20 = 843.76 : x
  2. Step 2: Convert to fraction form
    925.72/1,387.20 = 843.76/x
  3. Step 3: Cross multiply
    925.72x = 1,387.20 × 843.76
  4. Step 4: Simplify right side
    925.72x = 1,170,463.87
  5. Step 5: Solve for x
    x = 1,170,463.87/925.72
  6. Step 6: Final answer
    x = 1,264.38

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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.