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Finding the Fourth Proportional to 1,426.86, 2,139.87 and 549.29

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Solution

The fourth proportional to 1,426.86, 2,139.87 and 549.29 is: 823.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.86 : 2,139.87 = 549.29 : x
  2. Step 2: Convert to fraction form
    1,426.86/2,139.87 = 549.29/x
  3. Step 3: Cross multiply
    1,426.86x = 2,139.87 × 549.29
  4. Step 4: Simplify right side
    1,426.86x = 1,175,414.54
  5. Step 5: Solve for x
    x = 1,175,414.54/1,426.86
  6. Step 6: Final answer
    x = 823.78

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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.