Home / 21,705.40-32,471.70-18,815.80

Finding the Fourth Proportional to 21,705.40, 32,471.70 and 18,815.80

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Solution

The fourth proportional to 21,705.40, 32,471.70 and 18,815.80 is: 28,148.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,705.40 : 32,471.70 = 18,815.80 : x
  2. Step 2: Convert to fraction form
    21,705.40/32,471.70 = 18,815.80/x
  3. Step 3: Cross multiply
    21,705.40x = 32,471.70 × 18,815.80
  4. Step 4: Simplify right side
    21,705.40x = 610,981,012.86
  5. Step 5: Solve for x
    x = 610,981,012.86/21,705.40
  6. Step 6: Final answer
    x = 28,148.80

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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.