Home / 20,744.80-31,121.20-8,898.40

Finding the Fourth Proportional to 20,744.80, 31,121.20 and 8,898.40

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Solution

The fourth proportional to 20,744.80, 31,121.20 and 8,898.40 is: 13,349.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,744.80 : 31,121.20 = 8,898.40 : x
  2. Step 2: Convert to fraction form
    20,744.80/31,121.20 = 8,898.40/x
  3. Step 3: Cross multiply
    20,744.80x = 31,121.20 × 8,898.40
  4. Step 4: Simplify right side
    20,744.80x = 276,928,886.08
  5. Step 5: Solve for x
    x = 276,928,886.08/20,744.80
  6. Step 6: Final answer
    x = 13,349.32

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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.