Home / 1,426.80-2,140.20-1,256.70

Finding the Fourth Proportional to 1,426.80, 2,140.20 and 1,256.70

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Solution

The fourth proportional to 1,426.80, 2,140.20 and 1,256.70 is: 1,885.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.80 : 2,140.20 = 1,256.70 : x
  2. Step 2: Convert to fraction form
    1,426.80/2,140.20 = 1,256.70/x
  3. Step 3: Cross multiply
    1,426.80x = 2,140.20 × 1,256.70
  4. Step 4: Simplify right side
    1,426.80x = 2,689,589.34
  5. Step 5: Solve for x
    x = 2,689,589.34/1,426.80
  6. Step 6: Final answer
    x = 1,885.05

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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.