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Finding the Fourth Proportional to 21,991.60, 32,987.40 and 20,177.20

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Solution

The fourth proportional to 21,991.60, 32,987.40 and 20,177.20 is: 30,265.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.60 : 32,987.40 = 20,177.20 : x
  2. Step 2: Convert to fraction form
    21,991.60/32,987.40 = 20,177.20/x
  3. Step 3: Cross multiply
    21,991.60x = 32,987.40 × 20,177.20
  4. Step 4: Simplify right side
    21,991.60x = 665,593,367.28
  5. Step 5: Solve for x
    x = 665,593,367.28/21,991.60
  6. Step 6: Final answer
    x = 30,265.80

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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.