Home / 20,789.78-31,183.70-7,641.18

Finding the Fourth Proportional to 20,789.78, 31,183.70 and 7,641.18

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Solution

The fourth proportional to 20,789.78, 31,183.70 and 7,641.18 is: 11,461.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,789.78 : 31,183.70 = 7,641.18 : x
  2. Step 2: Convert to fraction form
    20,789.78/31,183.70 = 7,641.18/x
  3. Step 3: Cross multiply
    20,789.78x = 31,183.70 × 7,641.18
  4. Step 4: Simplify right side
    20,789.78x = 238,280,226.56
  5. Step 5: Solve for x
    x = 238,280,226.56/20,789.78
  6. Step 6: Final answer
    x = 11,461.41

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1.5x scale

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.