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Finding the Fourth Proportional to 21,991.40, 33,035.70 and 21,165.20

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Solution

The fourth proportional to 21,991.40, 33,035.70 and 21,165.20 is: 31,794.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.40 : 33,035.70 = 21,165.20 : x
  2. Step 2: Convert to fraction form
    21,991.40/33,035.70 = 21,165.20/x
  3. Step 3: Cross multiply
    21,991.40x = 33,035.70 × 21,165.20
  4. Step 4: Simplify right side
    21,991.40x = 699,207,197.64
  5. Step 5: Solve for x
    x = 699,207,197.64/21,991.40
  6. Step 6: Final answer
    x = 31,794.57

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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.