Home / 21,013.20-28,996.49-11,581.76

Finding the Fourth Proportional to 21,013.20, 28,996.49 and 11,581.76

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Solution

The fourth proportional to 21,013.20, 28,996.49 and 11,581.76 is: 15,981.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,013.20 : 28,996.49 = 11,581.76 : x
  2. Step 2: Convert to fraction form
    21,013.20/28,996.49 = 11,581.76/x
  3. Step 3: Cross multiply
    21,013.20x = 28,996.49 × 11,581.76
  4. Step 4: Simplify right side
    21,013.20x = 335,830,185.13
  5. Step 5: Solve for x
    x = 335,830,185.13/21,013.20
  6. Step 6: Final answer
    x = 15,981.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.