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Finding the Fourth Proportional to 814.72, 1,123.68 and 499.72

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Solution

The fourth proportional to 814.72, 1,123.68 and 499.72 is: 689.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.72 : 1,123.68 = 499.72 : x
  2. Step 2: Convert to fraction form
    814.72/1,123.68 = 499.72/x
  3. Step 3: Cross multiply
    814.72x = 1,123.68 × 499.72
  4. Step 4: Simplify right side
    814.72x = 561,525.37
  5. Step 5: Solve for x
    x = 561,525.37/814.72
  6. Step 6: Final answer
    x = 689.22

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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.