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Finding the Fourth Proportional to 842.49, 1,261.34 and 669.41

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Solution

The fourth proportional to 842.49, 1,261.34 and 669.41 is: 1,002.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.49 : 1,261.34 = 669.41 : x
  2. Step 2: Convert to fraction form
    842.49/1,261.34 = 669.41/x
  3. Step 3: Cross multiply
    842.49x = 1,261.34 × 669.41
  4. Step 4: Simplify right side
    842.49x = 844,343.96
  5. Step 5: Solve for x
    x = 844,343.96/842.49
  6. Step 6: Final answer
    x = 1,002.20

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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.