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Finding the Fourth Proportional to 71,322.74, 106,984 and 21,402.75

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Solution

The fourth proportional to 71,322.74, 106,984 and 21,402.75 is: 32,104.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,322.74 : 106,984 = 21,402.75 : x
  2. Step 2: Convert to fraction form
    71,322.74/106,984 = 21,402.75/x
  3. Step 3: Cross multiply
    71,322.74x = 106,984 × 21,402.75
  4. Step 4: Simplify right side
    71,322.74x = 2,289,751,806
  5. Step 5: Solve for x
    x = 2,289,751,806/71,322.74
  6. Step 6: Final answer
    x = 32,104.09

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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.