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Finding the Fourth Proportional to 21,802.60, 32,703.90 and 20,198.80

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Solution

The fourth proportional to 21,802.60, 32,703.90 and 20,198.80 is: 30,298.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,802.60 : 32,703.90 = 20,198.80 : x
  2. Step 2: Convert to fraction form
    21,802.60/32,703.90 = 20,198.80/x
  3. Step 3: Cross multiply
    21,802.60x = 32,703.90 × 20,198.80
  4. Step 4: Simplify right side
    21,802.60x = 660,579,535.32
  5. Step 5: Solve for x
    x = 660,579,535.32/21,802.60
  6. Step 6: Final answer
    x = 30,298.20

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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.