Home / 20,767.28-31,156.38-7,619.76

Finding the Fourth Proportional to 20,767.28, 31,156.38 and 7,619.76

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Solution

The fourth proportional to 20,767.28, 31,156.38 and 7,619.76 is: 11,431.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,767.28 : 31,156.38 = 7,619.76 : x
  2. Step 2: Convert to fraction form
    20,767.28/31,156.38 = 7,619.76/x
  3. Step 3: Cross multiply
    20,767.28x = 31,156.38 × 7,619.76
  4. Step 4: Simplify right side
    20,767.28x = 237,404,138.07
  5. Step 5: Solve for x
    x = 237,404,138.07/20,767.28
  6. Step 6: Final answer
    x = 11,431.65

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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.