Home / 20,818.81-31,228.62-7,664.41

Finding the Fourth Proportional to 20,818.81, 31,228.62 and 7,664.41

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Solution

The fourth proportional to 20,818.81, 31,228.62 and 7,664.41 is: 11,496.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.81 : 31,228.62 = 7,664.41 : x
  2. Step 2: Convert to fraction form
    20,818.81/31,228.62 = 7,664.41/x
  3. Step 3: Cross multiply
    20,818.81x = 31,228.62 × 7,664.41
  4. Step 4: Simplify right side
    20,818.81x = 239,348,947.41
  5. Step 5: Solve for x
    x = 239,348,947.41/20,818.81
  6. Step 6: Final answer
    x = 11,496.76

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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.