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Finding the Fourth Proportional to 21,991.38, 32,989.84 and 6,993.16

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Solution

The fourth proportional to 21,991.38, 32,989.84 and 6,993.16 is: 10,490.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.38 : 32,989.84 = 6,993.16 : x
  2. Step 2: Convert to fraction form
    21,991.38/32,989.84 = 6,993.16/x
  3. Step 3: Cross multiply
    21,991.38x = 32,989.84 × 6,993.16
  4. Step 4: Simplify right side
    21,991.38x = 230,703,229.49
  5. Step 5: Solve for x
    x = 230,703,229.49/21,991.38
  6. Step 6: Final answer
    x = 10,490.62

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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.