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Finding the Fourth Proportional to 814.02, 1,123.50 and 639.68

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Solution

The fourth proportional to 814.02, 1,123.50 and 639.68 is: 882.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.02 : 1,123.50 = 639.68 : x
  2. Step 2: Convert to fraction form
    814.02/1,123.50 = 639.68/x
  3. Step 3: Cross multiply
    814.02x = 1,123.50 × 639.68
  4. Step 4: Simplify right side
    814.02x = 718,674.86
  5. Step 5: Solve for x
    x = 718,674.86/814.02
  6. Step 6: Final answer
    x = 882.87

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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.