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Finding the Fourth Proportional to 668.55, 1,003.00 and 278.42

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Solution

The fourth proportional to 668.55, 1,003.00 and 278.42 is: 417.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.55 : 1,003.00 = 278.42 : x
  2. Step 2: Convert to fraction form
    668.55/1,003.00 = 278.42/x
  3. Step 3: Cross multiply
    668.55x = 1,003.00 × 278.42
  4. Step 4: Simplify right side
    668.55x = 279,257.07
  5. Step 5: Solve for x
    x = 279,257.07/668.55
  6. Step 6: Final answer
    x = 417.71

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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.