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Finding the Fourth Proportional to 21,761.60, 32,643.52 and 7,910.08

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Solution

The fourth proportional to 21,761.60, 32,643.52 and 7,910.08 is: 11,865.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,761.60 : 32,643.52 = 7,910.08 : x
  2. Step 2: Convert to fraction form
    21,761.60/32,643.52 = 7,910.08/x
  3. Step 3: Cross multiply
    21,761.60x = 32,643.52 × 7,910.08
  4. Step 4: Simplify right side
    21,761.60x = 258,212,854.68
  5. Step 5: Solve for x
    x = 258,212,854.68/21,761.60
  6. Step 6: Final answer
    x = 11,865.53

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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.