Home / 20,812.80-28,721.66-11,381.37

Finding the Fourth Proportional to 20,812.80, 28,721.66 and 11,381.37

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Solution

The fourth proportional to 20,812.80, 28,721.66 and 11,381.37 is: 15,706.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.80 : 28,721.66 = 11,381.37 : x
  2. Step 2: Convert to fraction form
    20,812.80/28,721.66 = 11,381.37/x
  3. Step 3: Cross multiply
    20,812.80x = 28,721.66 × 11,381.37
  4. Step 4: Simplify right side
    20,812.80x = 326,891,638.96
  5. Step 5: Solve for x
    x = 326,891,638.96/20,812.80
  6. Step 6: Final answer
    x = 15,706.28

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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.