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Finding the Fourth Proportional to 814.11, 1,123.97 and 618.49

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Solution

The fourth proportional to 814.11, 1,123.97 and 618.49 is: 853.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.11 : 1,123.97 = 618.49 : x
  2. Step 2: Convert to fraction form
    814.11/1,123.97 = 618.49/x
  3. Step 3: Cross multiply
    814.11x = 1,123.97 × 618.49
  4. Step 4: Simplify right side
    814.11x = 695,164.21
  5. Step 5: Solve for x
    x = 695,164.21/814.11
  6. Step 6: Final answer
    x = 853.89

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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.