Home / 21,661.62-29,895.04-13,161.78

Finding the Fourth Proportional to 21,661.62, 29,895.04 and 13,161.78

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Solution

The fourth proportional to 21,661.62, 29,895.04 and 13,161.78 is: 18,164.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,661.62 : 29,895.04 = 13,161.78 : x
  2. Step 2: Convert to fraction form
    21,661.62/29,895.04 = 13,161.78/x
  3. Step 3: Cross multiply
    21,661.62x = 29,895.04 × 13,161.78
  4. Step 4: Simplify right side
    21,661.62x = 393,471,956.02
  5. Step 5: Solve for x
    x = 393,471,956.02/21,661.62
  6. Step 6: Final answer
    x = 18,164.48

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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.