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Finding the Fourth Proportional to 21,721.20, 32,651.40 and 20,180.40

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Solution

The fourth proportional to 21,721.20, 32,651.40 and 20,180.40 is: 30,335.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,721.20 : 32,651.40 = 20,180.40 : x
  2. Step 2: Convert to fraction form
    21,721.20/32,651.40 = 20,180.40/x
  3. Step 3: Cross multiply
    21,721.20x = 32,651.40 × 20,180.40
  4. Step 4: Simplify right side
    21,721.20x = 658,918,312.56
  5. Step 5: Solve for x
    x = 658,918,312.56/21,721.20
  6. Step 6: Final answer
    x = 30,335.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.