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Finding the Fourth Proportional to 21,991.20, 30,748.80 and 21,991.20

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Solution

The fourth proportional to 21,991.20, 30,748.80 and 21,991.20 is: 30,748.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.20 : 30,748.80 = 21,991.20 : x
  2. Step 2: Convert to fraction form
    21,991.20/30,748.80 = 21,991.20/x
  3. Step 3: Cross multiply
    21,991.20x = 30,748.80 × 21,991.20
  4. Step 4: Simplify right side
    21,991.20x = 676,203,010.56
  5. Step 5: Solve for x
    x = 676,203,010.56/21,991.20
  6. Step 6: Final answer
    x = 30,748.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.