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Finding the Fourth Proportional to 1,229.02, 1,838.90 and 681.59

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Solution

The fourth proportional to 1,229.02, 1,838.90 and 681.59 is: 1,019.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.02 : 1,838.90 = 681.59 : x
  2. Step 2: Convert to fraction form
    1,229.02/1,838.90 = 681.59/x
  3. Step 3: Cross multiply
    1,229.02x = 1,838.90 × 681.59
  4. Step 4: Simplify right side
    1,229.02x = 1,253,382.15
  5. Step 5: Solve for x
    x = 1,253,382.15/1,229.02
  6. Step 6: Final answer
    x = 1,019.82

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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.