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Finding the Fourth Proportional to 71,922.40, 107,856.24 and 21,987.28

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Solution

The fourth proportional to 71,922.40, 107,856.24 and 21,987.28 is: 32,972.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,922.40 : 107,856.24 = 21,987.28 : x
  2. Step 2: Convert to fraction form
    71,922.40/107,856.24 = 21,987.28/x
  3. Step 3: Cross multiply
    71,922.40x = 107,856.24 × 21,987.28
  4. Step 4: Simplify right side
    71,922.40x = 2,371,465,348.63
  5. Step 5: Solve for x
    x = 2,371,465,348.63/71,922.40
  6. Step 6: Final answer
    x = 32,972.56

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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.