Home / 20,911.28-31,343.22-10,388.63

Finding the Fourth Proportional to 20,911.28, 31,343.22 and 10,388.63

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Solution

The fourth proportional to 20,911.28, 31,343.22 and 10,388.63 is: 15,571.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.28 : 31,343.22 = 10,388.63 : x
  2. Step 2: Convert to fraction form
    20,911.28/31,343.22 = 10,388.63/x
  3. Step 3: Cross multiply
    20,911.28x = 31,343.22 × 10,388.63
  4. Step 4: Simplify right side
    20,911.28x = 325,613,115.59
  5. Step 5: Solve for x
    x = 325,613,115.59/20,911.28
  6. Step 6: Final answer
    x = 15,571.17

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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.