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Finding the Fourth Proportional to 666.92, 1,000.38 and 378.56

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Solution

The fourth proportional to 666.92, 1,000.38 and 378.56 is: 567.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.92 : 1,000.38 = 378.56 : x
  2. Step 2: Convert to fraction form
    666.92/1,000.38 = 378.56/x
  3. Step 3: Cross multiply
    666.92x = 1,000.38 × 378.56
  4. Step 4: Simplify right side
    666.92x = 378,703.85
  5. Step 5: Solve for x
    x = 378,703.85/666.92
  6. Step 6: Final answer
    x = 567.84

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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.