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Finding the Fourth Proportional to 21,990.78, 32,989.05 and 7,195.74

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Solution

The fourth proportional to 21,990.78, 32,989.05 and 7,195.74 is: 10,794.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.78 : 32,989.05 = 7,195.74 : x
  2. Step 2: Convert to fraction form
    21,990.78/32,989.05 = 7,195.74/x
  3. Step 3: Cross multiply
    21,990.78x = 32,989.05 × 7,195.74
  4. Step 4: Simplify right side
    21,990.78x = 237,380,626.65
  5. Step 5: Solve for x
    x = 237,380,626.65/21,990.78
  6. Step 6: Final answer
    x = 10,794.55

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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.