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Finding the Fourth Proportional to 1,229.40, 1,845.90 and 865.80

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Solution

The fourth proportional to 1,229.40, 1,845.90 and 865.80 is: 1,299.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.40 : 1,845.90 = 865.80 : x
  2. Step 2: Convert to fraction form
    1,229.40/1,845.90 = 865.80/x
  3. Step 3: Cross multiply
    1,229.40x = 1,845.90 × 865.80
  4. Step 4: Simplify right side
    1,229.40x = 1,598,180.22
  5. Step 5: Solve for x
    x = 1,598,180.22/1,229.40
  6. Step 6: Final answer
    x = 1,299.97

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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.