Home / 1,381.20-2,075.92-1,279.38

Finding the Fourth Proportional to 1,381.20, 2,075.92 and 1,279.38

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Solution

The fourth proportional to 1,381.20, 2,075.92 and 1,279.38 is: 1,922.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.20 : 2,075.92 = 1,279.38 : x
  2. Step 2: Convert to fraction form
    1,381.20/2,075.92 = 1,279.38/x
  3. Step 3: Cross multiply
    1,381.20x = 2,075.92 × 1,279.38
  4. Step 4: Simplify right side
    1,381.20x = 2,655,890.53
  5. Step 5: Solve for x
    x = 2,655,890.53/1,381.20
  6. Step 6: Final answer
    x = 1,922.89

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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.