Home / 1,543.38-2,128.05-1,247.73

Finding the Fourth Proportional to 1,543.38, 2,128.05 and 1,247.73

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Solution

The fourth proportional to 1,543.38, 2,128.05 and 1,247.73 is: 1,720.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,543.38 : 2,128.05 = 1,247.73 : x
  2. Step 2: Convert to fraction form
    1,543.38/2,128.05 = 1,247.73/x
  3. Step 3: Cross multiply
    1,543.38x = 2,128.05 × 1,247.73
  4. Step 4: Simplify right side
    1,543.38x = 2,655,231.83
  5. Step 5: Solve for x
    x = 2,655,231.83/1,543.38
  6. Step 6: Final answer
    x = 1,720.40

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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.