Home / 1,542.28-2,128.40-843.72

Finding the Fourth Proportional to 1,542.28, 2,128.40 and 843.72

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Solution

The fourth proportional to 1,542.28, 2,128.40 and 843.72 is: 1,164.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,542.28 : 2,128.40 = 843.72 : x
  2. Step 2: Convert to fraction form
    1,542.28/2,128.40 = 843.72/x
  3. Step 3: Cross multiply
    1,542.28x = 2,128.40 × 843.72
  4. Step 4: Simplify right side
    1,542.28x = 1,795,773.65
  5. Step 5: Solve for x
    x = 1,795,773.65/1,542.28
  6. Step 6: Final answer
    x = 1,164.36

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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.