Home / 21,685.28-29,921.64-13,721.90

Finding the Fourth Proportional to 21,685.28, 29,921.64 and 13,721.90

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Solution

The fourth proportional to 21,685.28, 29,921.64 and 13,721.90 is: 18,933.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,685.28 : 29,921.64 = 13,721.90 : x
  2. Step 2: Convert to fraction form
    21,685.28/29,921.64 = 13,721.90/x
  3. Step 3: Cross multiply
    21,685.28x = 29,921.64 × 13,721.90
  4. Step 4: Simplify right side
    21,685.28x = 410,581,751.92
  5. Step 5: Solve for x
    x = 410,581,751.92/21,685.28
  6. Step 6: Final answer
    x = 18,933.66

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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.