Home / 20,809.89-28,717.62-11,378.43

Finding the Fourth Proportional to 20,809.89, 28,717.62 and 11,378.43

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Solution

The fourth proportional to 20,809.89, 28,717.62 and 11,378.43 is: 15,702.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,809.89 : 28,717.62 = 11,378.43 : x
  2. Step 2: Convert to fraction form
    20,809.89/28,717.62 = 11,378.43/x
  3. Step 3: Cross multiply
    20,809.89x = 28,717.62 × 11,378.43
  4. Step 4: Simplify right side
    20,809.89x = 326,761,428.94
  5. Step 5: Solve for x
    x = 326,761,428.94/20,809.89
  6. Step 6: Final answer
    x = 15,702.22

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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.