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Finding the Fourth Proportional to 925.83, 1,389.61 and 579.86

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Solution

The fourth proportional to 925.83, 1,389.61 and 579.86 is: 870.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.83 : 1,389.61 = 579.86 : x
  2. Step 2: Convert to fraction form
    925.83/1,389.61 = 579.86/x
  3. Step 3: Cross multiply
    925.83x = 1,389.61 × 579.86
  4. Step 4: Simplify right side
    925.83x = 805,774.98
  5. Step 5: Solve for x
    x = 805,774.98/925.83
  6. Step 6: Final answer
    x = 870.33

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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.