Home / 20,810.72-31,201.49-7,661.38

Finding the Fourth Proportional to 20,810.72, 31,201.49 and 7,661.38

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Solution

The fourth proportional to 20,810.72, 31,201.49 and 7,661.38 is: 11,486.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.72 : 31,201.49 = 7,661.38 : x
  2. Step 2: Convert to fraction form
    20,810.72/31,201.49 = 7,661.38/x
  3. Step 3: Cross multiply
    20,810.72x = 31,201.49 × 7,661.38
  4. Step 4: Simplify right side
    20,810.72x = 239,046,471.46
  5. Step 5: Solve for x
    x = 239,046,471.46/20,810.72
  6. Step 6: Final answer
    x = 11,486.70

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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.