Home / 1,426.40-2,139.60-876.80

Finding the Fourth Proportional to 1,426.40, 2,139.60 and 876.80

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Solution

The fourth proportional to 1,426.40, 2,139.60 and 876.80 is: 1,315.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.40 : 2,139.60 = 876.80 : x
  2. Step 2: Convert to fraction form
    1,426.40/2,139.60 = 876.80/x
  3. Step 3: Cross multiply
    1,426.40x = 2,139.60 × 876.80
  4. Step 4: Simplify right side
    1,426.40x = 1,876,001.28
  5. Step 5: Solve for x
    x = 1,876,001.28/1,426.40
  6. Step 6: Final answer
    x = 1,315.20

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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.