Home / 21,011.25-28,995.62-11,579.61

Finding the Fourth Proportional to 21,011.25, 28,995.62 and 11,579.61

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Solution

The fourth proportional to 21,011.25, 28,995.62 and 11,579.61 is: 15,979.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.25 : 28,995.62 = 11,579.61 : x
  2. Step 2: Convert to fraction form
    21,011.25/28,995.62 = 11,579.61/x
  3. Step 3: Cross multiply
    21,011.25x = 28,995.62 × 11,579.61
  4. Step 4: Simplify right side
    21,011.25x = 335,757,913.41
  5. Step 5: Solve for x
    x = 335,757,913.41/21,011.25
  6. Step 6: Final answer
    x = 15,979.91

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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.