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Finding the Fourth Proportional to 21,991.20, 32,986.80 and 21,213.60

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Solution

The fourth proportional to 21,991.20, 32,986.80 and 21,213.60 is: 31,820.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.20 : 32,986.80 = 21,213.60 : x
  2. Step 2: Convert to fraction form
    21,991.20/32,986.80 = 21,213.60/x
  3. Step 3: Cross multiply
    21,991.20x = 32,986.80 × 21,213.60
  4. Step 4: Simplify right side
    21,991.20x = 699,768,780.48
  5. Step 5: Solve for x
    x = 699,768,780.48/21,991.20
  6. Step 6: Final answer
    x = 31,820.40

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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.