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Finding the Fourth Proportional to 668.62, 1,002.06 and 278.56

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Solution

The fourth proportional to 668.62, 1,002.06 and 278.56 is: 417.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.62 : 1,002.06 = 278.56 : x
  2. Step 2: Convert to fraction form
    668.62/1,002.06 = 278.56/x
  3. Step 3: Cross multiply
    668.62x = 1,002.06 × 278.56
  4. Step 4: Simplify right side
    668.62x = 279,133.83
  5. Step 5: Solve for x
    x = 279,133.83/668.62
  6. Step 6: Final answer
    x = 417.48

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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.