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Finding the Fourth Proportional to 21,990.70, 32,986.05 and 13,696.30

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Solution

The fourth proportional to 21,990.70, 32,986.05 and 13,696.30 is: 20,544.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.70 : 32,986.05 = 13,696.30 : x
  2. Step 2: Convert to fraction form
    21,990.70/32,986.05 = 13,696.30/x
  3. Step 3: Cross multiply
    21,990.70x = 32,986.05 × 13,696.30
  4. Step 4: Simplify right side
    21,990.70x = 451,786,836.62
  5. Step 5: Solve for x
    x = 451,786,836.62/21,990.70
  6. Step 6: Final answer
    x = 20,544.45

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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.