Home / 20,809.72-31,199.97-7,660.40

Finding the Fourth Proportional to 20,809.72, 31,199.97 and 7,660.40

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Solution

The fourth proportional to 20,809.72, 31,199.97 and 7,660.40 is: 11,485.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,809.72 : 31,199.97 = 7,660.40 : x
  2. Step 2: Convert to fraction form
    20,809.72/31,199.97 = 7,660.40/x
  3. Step 3: Cross multiply
    20,809.72x = 31,199.97 × 7,660.40
  4. Step 4: Simplify right side
    20,809.72x = 239,004,250.19
  5. Step 5: Solve for x
    x = 239,004,250.19/20,809.72
  6. Step 6: Final answer
    x = 11,485.22

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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.