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Finding the Fourth Proportional to 925.65, 1,386 and 617.85

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Solution

The fourth proportional to 925.65, 1,386 and 617.85 is: 925.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.65 : 1,386 = 617.85 : x
  2. Step 2: Convert to fraction form
    925.65/1,386 = 617.85/x
  3. Step 3: Cross multiply
    925.65x = 1,386 × 617.85
  4. Step 4: Simplify right side
    925.65x = 856,340.10
  5. Step 5: Solve for x
    x = 856,340.10/925.65
  6. Step 6: Final answer
    x = 925.12

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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.