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Finding the Fourth Proportional to 21,384.60, 32,016.15 and 20,220.90

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Solution

The fourth proportional to 21,384.60, 32,016.15 and 20,220.90 is: 30,273.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,384.60 : 32,016.15 = 20,220.90 : x
  2. Step 2: Convert to fraction form
    21,384.60/32,016.15 = 20,220.90/x
  3. Step 3: Cross multiply
    21,384.60x = 32,016.15 × 20,220.90
  4. Step 4: Simplify right side
    21,384.60x = 647,395,367.54
  5. Step 5: Solve for x
    x = 647,395,367.54/21,384.60
  6. Step 6: Final answer
    x = 30,273.91

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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.