Home / 21,076.38-31,619.18-7,928.75

Finding the Fourth Proportional to 21,076.38, 31,619.18 and 7,928.75

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Solution

The fourth proportional to 21,076.38, 31,619.18 and 7,928.75 is: 11,894.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,076.38 : 31,619.18 = 7,928.75 : x
  2. Step 2: Convert to fraction form
    21,076.38/31,619.18 = 7,928.75/x
  3. Step 3: Cross multiply
    21,076.38x = 31,619.18 × 7,928.75
  4. Step 4: Simplify right side
    21,076.38x = 250,700,672.29
  5. Step 5: Solve for x
    x = 250,700,672.29/21,076.38
  6. Step 6: Final answer
    x = 11,894.86

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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.