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Finding the Fourth Proportional to 814.32, 1,123.28 and 499.44

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Solution

The fourth proportional to 814.32, 1,123.28 and 499.44 is: 688.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.32 : 1,123.28 = 499.44 : x
  2. Step 2: Convert to fraction form
    814.32/1,123.28 = 499.44/x
  3. Step 3: Cross multiply
    814.32x = 1,123.28 × 499.44
  4. Step 4: Simplify right side
    814.32x = 561,010.96
  5. Step 5: Solve for x
    x = 561,010.96/814.32
  6. Step 6: Final answer
    x = 688.93

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1.5x scale

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.