Home / 20,288.89-27,998.90-11,215.38

Finding the Fourth Proportional to 20,288.89, 27,998.90 and 11,215.38

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Solution

The fourth proportional to 20,288.89, 27,998.90 and 11,215.38 is: 15,477.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,288.89 : 27,998.90 = 11,215.38 : x
  2. Step 2: Convert to fraction form
    20,288.89/27,998.90 = 11,215.38/x
  3. Step 3: Cross multiply
    20,288.89x = 27,998.90 × 11,215.38
  4. Step 4: Simplify right side
    20,288.89x = 314,018,107.01
  5. Step 5: Solve for x
    x = 314,018,107.01/20,288.89
  6. Step 6: Final answer
    x = 15,477.34

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Half scale
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Double scale
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Similar ratio
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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.