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Finding the Fourth Proportional to 925.88, 1,390.30 and 579.92

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Solution

The fourth proportional to 925.88, 1,390.30 and 579.92 is: 870.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.88 : 1,390.30 = 579.92 : x
  2. Step 2: Convert to fraction form
    925.88/1,390.30 = 579.92/x
  3. Step 3: Cross multiply
    925.88x = 1,390.30 × 579.92
  4. Step 4: Simplify right side
    925.88x = 806,262.78
  5. Step 5: Solve for x
    x = 806,262.78/925.88
  6. Step 6: Final answer
    x = 870.81

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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.