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Finding the Fourth Proportional to 666.74, 1,000.12 and 319.92

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Solution

The fourth proportional to 666.74, 1,000.12 and 319.92 is: 479.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.74 : 1,000.12 = 319.92 : x
  2. Step 2: Convert to fraction form
    666.74/1,000.12 = 319.92/x
  3. Step 3: Cross multiply
    666.74x = 1,000.12 × 319.92
  4. Step 4: Simplify right side
    666.74x = 319,958.39
  5. Step 5: Solve for x
    x = 319,958.39/666.74
  6. Step 6: Final answer
    x = 479.88

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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.