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Finding the Fourth Proportional to 21,856.80, 32,788.80 and 7,069.44

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Solution

The fourth proportional to 21,856.80, 32,788.80 and 7,069.44 is: 10,605.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,856.80 : 32,788.80 = 7,069.44 : x
  2. Step 2: Convert to fraction form
    21,856.80/32,788.80 = 7,069.44/x
  3. Step 3: Cross multiply
    21,856.80x = 32,788.80 × 7,069.44
  4. Step 4: Simplify right side
    21,856.80x = 231,798,454.27
  5. Step 5: Solve for x
    x = 231,798,454.27/21,856.80
  6. Step 6: Final answer
    x = 10,605.32

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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.