Home / 20,823.31-28,736.85-11,391.87

Finding the Fourth Proportional to 20,823.31, 28,736.85 and 11,391.87

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Solution

The fourth proportional to 20,823.31, 28,736.85 and 11,391.87 is: 15,721.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,823.31 : 28,736.85 = 11,391.87 : x
  2. Step 2: Convert to fraction form
    20,823.31/28,736.85 = 11,391.87/x
  3. Step 3: Cross multiply
    20,823.31x = 28,736.85 × 11,391.87
  4. Step 4: Simplify right side
    20,823.31x = 327,366,459.41
  5. Step 5: Solve for x
    x = 327,366,459.41/20,823.31
  6. Step 6: Final answer
    x = 15,721.16

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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.