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Finding the Fourth Proportional to 667.68, 1,000.70 and 406.86

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Solution

The fourth proportional to 667.68, 1,000.70 and 406.86 is: 609.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.68 : 1,000.70 = 406.86 : x
  2. Step 2: Convert to fraction form
    667.68/1,000.70 = 406.86/x
  3. Step 3: Cross multiply
    667.68x = 1,000.70 × 406.86
  4. Step 4: Simplify right side
    667.68x = 407,144.80
  5. Step 5: Solve for x
    x = 407,144.80/667.68
  6. Step 6: Final answer
    x = 609.79

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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.