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Finding the Fourth Proportional to 667.10, 999.30 and 342.65

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Solution

The fourth proportional to 667.10, 999.30 and 342.65 is: 513.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.10 : 999.30 = 342.65 : x
  2. Step 2: Convert to fraction form
    667.10/999.30 = 342.65/x
  3. Step 3: Cross multiply
    667.10x = 999.30 × 342.65
  4. Step 4: Simplify right side
    667.10x = 342,410.15
  5. Step 5: Solve for x
    x = 342,410.15/667.10
  6. Step 6: Final answer
    x = 513.28

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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.