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Finding the Fourth Proportional to 814.42, 1,124.01 and 499.87

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Solution

The fourth proportional to 814.42, 1,124.01 and 499.87 is: 689.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.42 : 1,124.01 = 499.87 : x
  2. Step 2: Convert to fraction form
    814.42/1,124.01 = 499.87/x
  3. Step 3: Cross multiply
    814.42x = 1,124.01 × 499.87
  4. Step 4: Simplify right side
    814.42x = 561,858.88
  5. Step 5: Solve for x
    x = 561,858.88/814.42
  6. Step 6: Final answer
    x = 689.89

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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.