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Finding the Fourth Proportional to 21,561.88, 32,353.90 and 8,921.02

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Solution

The fourth proportional to 21,561.88, 32,353.90 and 8,921.02 is: 13,386.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,561.88 : 32,353.90 = 8,921.02 : x
  2. Step 2: Convert to fraction form
    21,561.88/32,353.90 = 8,921.02/x
  3. Step 3: Cross multiply
    21,561.88x = 32,353.90 × 8,921.02
  4. Step 4: Simplify right side
    21,561.88x = 288,629,788.98
  5. Step 5: Solve for x
    x = 288,629,788.98/21,561.88
  6. Step 6: Final answer
    x = 13,386.11

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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.