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Finding the Fourth Proportional to 892.12, 1,230.92 and 518.90

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Solution

The fourth proportional to 892.12, 1,230.92 and 518.90 is: 715.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.12 : 1,230.92 = 518.90 : x
  2. Step 2: Convert to fraction form
    892.12/1,230.92 = 518.90/x
  3. Step 3: Cross multiply
    892.12x = 1,230.92 × 518.90
  4. Step 4: Simplify right side
    892.12x = 638,721.79
  5. Step 5: Solve for x
    x = 638,721.79/892.12
  6. Step 6: Final answer
    x = 715.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.