Home / 20,979.88-31,480.62-9,301.36

Finding the Fourth Proportional to 20,979.88, 31,480.62 and 9,301.36

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Solution

The fourth proportional to 20,979.88, 31,480.62 and 9,301.36 is: 13,956.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.88 : 31,480.62 = 9,301.36 : x
  2. Step 2: Convert to fraction form
    20,979.88/31,480.62 = 9,301.36/x
  3. Step 3: Cross multiply
    20,979.88x = 31,480.62 × 9,301.36
  4. Step 4: Simplify right side
    20,979.88x = 292,812,579.64
  5. Step 5: Solve for x
    x = 292,812,579.64/20,979.88
  6. Step 6: Final answer
    x = 13,956.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.