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Finding the Fourth Proportional to 680.02, 1,020.34 and 669.10

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Solution

The fourth proportional to 680.02, 1,020.34 and 669.10 is: 1,003.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.02 : 1,020.34 = 669.10 : x
  2. Step 2: Convert to fraction form
    680.02/1,020.34 = 669.10/x
  3. Step 3: Cross multiply
    680.02x = 1,020.34 × 669.10
  4. Step 4: Simplify right side
    680.02x = 682,709.49
  5. Step 5: Solve for x
    x = 682,709.49/680.02
  6. Step 6: Final answer
    x = 1,003.96

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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.