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Finding the Fourth Proportional to 667.10, 999.30 and 461.90

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Solution

The fourth proportional to 667.10, 999.30 and 461.90 is: 691.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.10 : 999.30 = 461.90 : x
  2. Step 2: Convert to fraction form
    667.10/999.30 = 461.90/x
  3. Step 3: Cross multiply
    667.10x = 999.30 × 461.90
  4. Step 4: Simplify right side
    667.10x = 461,576.67
  5. Step 5: Solve for x
    x = 461,576.67/667.10
  6. Step 6: Final answer
    x = 691.92

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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.