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Finding the Fourth Proportional to 667.46, 1,000.10 and 423.20

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Solution

The fourth proportional to 667.46, 1,000.10 and 423.20 is: 634.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.46 : 1,000.10 = 423.20 : x
  2. Step 2: Convert to fraction form
    667.46/1,000.10 = 423.20/x
  3. Step 3: Cross multiply
    667.46x = 1,000.10 × 423.20
  4. Step 4: Simplify right side
    667.46x = 423,242.32
  5. Step 5: Solve for x
    x = 423,242.32/667.46
  6. Step 6: Final answer
    x = 634.11

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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.