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Finding the Fourth Proportional to 813.92, 1,123.38 and 482.45

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Solution

The fourth proportional to 813.92, 1,123.38 and 482.45 is: 665.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.92 : 1,123.38 = 482.45 : x
  2. Step 2: Convert to fraction form
    813.92/1,123.38 = 482.45/x
  3. Step 3: Cross multiply
    813.92x = 1,123.38 × 482.45
  4. Step 4: Simplify right side
    813.92x = 541,969.06
  5. Step 5: Solve for x
    x = 541,969.06/813.92
  6. Step 6: Final answer
    x = 665.88

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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.