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Finding the Fourth Proportional to 1,542.92, 2,129.37 and 879.80

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Solution

The fourth proportional to 1,542.92, 2,129.37 and 879.80 is: 1,214.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,542.92 : 2,129.37 = 879.80 : x
  2. Step 2: Convert to fraction form
    1,542.92/2,129.37 = 879.80/x
  3. Step 3: Cross multiply
    1,542.92x = 2,129.37 × 879.80
  4. Step 4: Simplify right side
    1,542.92x = 1,873,419.73
  5. Step 5: Solve for x
    x = 1,873,419.73/1,542.92
  6. Step 6: Final answer
    x = 1,214.20

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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.