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Finding the Fourth Proportional to 1,489.92, 2,236.32 and 669.12

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Solution

The fourth proportional to 1,489.92, 2,236.32 and 669.12 is: 1,004.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.92 : 2,236.32 = 669.12 : x
  2. Step 2: Convert to fraction form
    1,489.92/2,236.32 = 669.12/x
  3. Step 3: Cross multiply
    1,489.92x = 2,236.32 × 669.12
  4. Step 4: Simplify right side
    1,489.92x = 1,496,366.44
  5. Step 5: Solve for x
    x = 1,496,366.44/1,489.92
  6. Step 6: Final answer
    x = 1,004.33

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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.