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Finding the Fourth Proportional to 21,958.87, 32,938.39 and 5,318.88

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Solution

The fourth proportional to 21,958.87, 32,938.39 and 5,318.88 is: 7,978.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,958.87 : 32,938.39 = 5,318.88 : x
  2. Step 2: Convert to fraction form
    21,958.87/32,938.39 = 5,318.88/x
  3. Step 3: Cross multiply
    21,958.87x = 32,938.39 × 5,318.88
  4. Step 4: Simplify right side
    21,958.87x = 175,195,343.80
  5. Step 5: Solve for x
    x = 175,195,343.80/21,958.87
  6. Step 6: Final answer
    x = 7,978.34

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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.