Home / 20,812.89-28,721.84-11,381.48

Finding the Fourth Proportional to 20,812.89, 28,721.84 and 11,381.48

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Solution

The fourth proportional to 20,812.89, 28,721.84 and 11,381.48 is: 15,706.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.89 : 28,721.84 = 11,381.48 : x
  2. Step 2: Convert to fraction form
    20,812.89/28,721.84 = 11,381.48/x
  3. Step 3: Cross multiply
    20,812.89x = 28,721.84 × 11,381.48
  4. Step 4: Simplify right side
    20,812.89x = 326,897,047.52
  5. Step 5: Solve for x
    x = 326,897,047.52/20,812.89
  6. Step 6: Final answer
    x = 15,706.47

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1.5x scale

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.