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Finding the Fourth Proportional to 21,991.55, 32,980.49 and 7,197.18

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Solution

The fourth proportional to 21,991.55, 32,980.49 and 7,197.18 is: 10,793.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.55 : 32,980.49 = 7,197.18 : x
  2. Step 2: Convert to fraction form
    21,991.55/32,980.49 = 7,197.18/x
  3. Step 3: Cross multiply
    21,991.55x = 32,980.49 × 7,197.18
  4. Step 4: Simplify right side
    21,991.55x = 237,366,523.02
  5. Step 5: Solve for x
    x = 237,366,523.02/21,991.55
  6. Step 6: Final answer
    x = 10,793.53

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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.