Home / 21,820.80-32,764-12,471.36

Finding the Fourth Proportional to 21,820.80, 32,764 and 12,471.36

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Solution

The fourth proportional to 21,820.80, 32,764 and 12,471.36 is: 18,725.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,820.80 : 32,764 = 12,471.36 : x
  2. Step 2: Convert to fraction form
    21,820.80/32,764 = 12,471.36/x
  3. Step 3: Cross multiply
    21,820.80x = 32,764 × 12,471.36
  4. Step 4: Simplify right side
    21,820.80x = 408,611,639.04
  5. Step 5: Solve for x
    x = 408,611,639.04/21,820.80
  6. Step 6: Final answer
    x = 18,725.79

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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.