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Finding the Fourth Proportional to 925.78, 1,387.61 and 579.21

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Solution

The fourth proportional to 925.78, 1,387.61 and 579.21 is: 868.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.78 : 1,387.61 = 579.21 : x
  2. Step 2: Convert to fraction form
    925.78/1,387.61 = 579.21/x
  3. Step 3: Cross multiply
    925.78x = 1,387.61 × 579.21
  4. Step 4: Simplify right side
    925.78x = 803,717.59
  5. Step 5: Solve for x
    x = 803,717.59/925.78
  6. Step 6: Final answer
    x = 868.15

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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.