Home / 21,869.80-32,820.90-8,731.60

Finding the Fourth Proportional to 21,869.80, 32,820.90 and 8,731.60

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Solution

The fourth proportional to 21,869.80, 32,820.90 and 8,731.60 is: 13,103.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,869.80 : 32,820.90 = 8,731.60 : x
  2. Step 2: Convert to fraction form
    21,869.80/32,820.90 = 8,731.60/x
  3. Step 3: Cross multiply
    21,869.80x = 32,820.90 × 8,731.60
  4. Step 4: Simplify right side
    21,869.80x = 286,578,970.44
  5. Step 5: Solve for x
    x = 286,578,970.44/21,869.80
  6. Step 6: Final answer
    x = 13,103.87

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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.