Home / 21,165.57-29,195.19-13,621.68

Finding the Fourth Proportional to 21,165.57, 29,195.19 and 13,621.68

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Solution

The fourth proportional to 21,165.57, 29,195.19 and 13,621.68 is: 18,789.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,165.57 : 29,195.19 = 13,621.68 : x
  2. Step 2: Convert to fraction form
    21,165.57/29,195.19 = 13,621.68/x
  3. Step 3: Cross multiply
    21,165.57x = 29,195.19 × 13,621.68
  4. Step 4: Simplify right side
    21,165.57x = 397,687,535.72
  5. Step 5: Solve for x
    x = 397,687,535.72/21,165.57
  6. Step 6: Final answer
    x = 18,789.36

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Double scale
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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.