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Finding the Fourth Proportional to 21,897.68, 32,871.09 and 8,759.21

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Solution

The fourth proportional to 21,897.68, 32,871.09 and 8,759.21 is: 13,148.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,897.68 : 32,871.09 = 8,759.21 : x
  2. Step 2: Convert to fraction form
    21,897.68/32,871.09 = 8,759.21/x
  3. Step 3: Cross multiply
    21,897.68x = 32,871.09 × 8,759.21
  4. Step 4: Simplify right side
    21,897.68x = 287,924,780.24
  5. Step 5: Solve for x
    x = 287,924,780.24/21,897.68
  6. Step 6: Final answer
    x = 13,148.64

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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.