Home / 13,821.07-20,715.20-7,965.58

Finding the Fourth Proportional to 13,821.07, 20,715.20 and 7,965.58

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Solution

The fourth proportional to 13,821.07, 20,715.20 and 7,965.58 is: 11,938.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,821.07 : 20,715.20 = 7,965.58 : x
  2. Step 2: Convert to fraction form
    13,821.07/20,715.20 = 7,965.58/x
  3. Step 3: Cross multiply
    13,821.07x = 20,715.20 × 7,965.58
  4. Step 4: Simplify right side
    13,821.07x = 165,008,521.07
  5. Step 5: Solve for x
    x = 165,008,521.07/13,821.07
  6. Step 6: Final answer
    x = 11,938.91

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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.