Home / 21,711.40-32,480.70-18,821.80

Finding the Fourth Proportional to 21,711.40, 32,480.70 and 18,821.80

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Solution

The fourth proportional to 21,711.40, 32,480.70 and 18,821.80 is: 28,157.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,711.40 : 32,480.70 = 18,821.80 : x
  2. Step 2: Convert to fraction form
    21,711.40/32,480.70 = 18,821.80/x
  3. Step 3: Cross multiply
    21,711.40x = 32,480.70 × 18,821.80
  4. Step 4: Simplify right side
    21,711.40x = 611,345,239.26
  5. Step 5: Solve for x
    x = 611,345,239.26/21,711.40
  6. Step 6: Final answer
    x = 28,157.80

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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.