Home / 2,279.21-3,142.80-1,438.97

Finding the Fourth Proportional to 2,279.21, 3,142.80 and 1,438.97

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Solution

The fourth proportional to 2,279.21, 3,142.80 and 1,438.97 is: 1,984.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,279.21 : 3,142.80 = 1,438.97 : x
  2. Step 2: Convert to fraction form
    2,279.21/3,142.80 = 1,438.97/x
  3. Step 3: Cross multiply
    2,279.21x = 3,142.80 × 1,438.97
  4. Step 4: Simplify right side
    2,279.21x = 4,522,379.20
  5. Step 5: Solve for x
    x = 4,522,379.20/2,279.21
  6. Step 6: Final answer
    x = 1,984.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.