Home / 21,387.76-29,515.78-11,956.28

Finding the Fourth Proportional to 21,387.76, 29,515.78 and 11,956.28

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Solution

The fourth proportional to 21,387.76, 29,515.78 and 11,956.28 is: 16,500.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,387.76 : 29,515.78 = 11,956.28 : x
  2. Step 2: Convert to fraction form
    21,387.76/29,515.78 = 11,956.28/x
  3. Step 3: Cross multiply
    21,387.76x = 29,515.78 × 11,956.28
  4. Step 4: Simplify right side
    21,387.76x = 352,898,930.10
  5. Step 5: Solve for x
    x = 352,898,930.10/21,387.76
  6. Step 6: Final answer
    x = 16,500.04

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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.