Home / 20,715.75-31,078.49-6,864.75

Finding the Fourth Proportional to 20,715.75, 31,078.49 and 6,864.75

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Solution

The fourth proportional to 20,715.75, 31,078.49 and 6,864.75 is: 10,298.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,715.75 : 31,078.49 = 6,864.75 : x
  2. Step 2: Convert to fraction form
    20,715.75/31,078.49 = 6,864.75/x
  3. Step 3: Cross multiply
    20,715.75x = 31,078.49 × 6,864.75
  4. Step 4: Simplify right side
    20,715.75x = 213,346,029.90
  5. Step 5: Solve for x
    x = 213,346,029.90/20,715.75
  6. Step 6: Final answer
    x = 10,298.74

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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.