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Finding the Fourth Proportional to 666.92, 1,000.03 and 319.94

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Solution

The fourth proportional to 666.92, 1,000.03 and 319.94 is: 479.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.92 : 1,000.03 = 319.94 : x
  2. Step 2: Convert to fraction form
    666.92/1,000.03 = 319.94/x
  3. Step 3: Cross multiply
    666.92x = 1,000.03 × 319.94
  4. Step 4: Simplify right side
    666.92x = 319,949.60
  5. Step 5: Solve for x
    x = 319,949.60/666.92
  6. Step 6: Final answer
    x = 479.74

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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.