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Finding the Fourth Proportional to 668.99, 1,003.85 and 279.27

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Solution

The fourth proportional to 668.99, 1,003.85 and 279.27 is: 419.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.99 : 1,003.85 = 279.27 : x
  2. Step 2: Convert to fraction form
    668.99/1,003.85 = 279.27/x
  3. Step 3: Cross multiply
    668.99x = 1,003.85 × 279.27
  4. Step 4: Simplify right side
    668.99x = 280,343.79
  5. Step 5: Solve for x
    x = 280,343.79/668.99
  6. Step 6: Final answer
    x = 419.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.