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Finding the Fourth Proportional to 668.75, 1,003.49 and 278.66

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Solution

The fourth proportional to 668.75, 1,003.49 and 278.66 is: 418.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.75 : 1,003.49 = 278.66 : x
  2. Step 2: Convert to fraction form
    668.75/1,003.49 = 278.66/x
  3. Step 3: Cross multiply
    668.75x = 1,003.49 × 278.66
  4. Step 4: Simplify right side
    668.75x = 279,626.11
  5. Step 5: Solve for x
    x = 279,626.11/668.75
  6. Step 6: Final answer
    x = 418.14

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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.