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Finding the Fourth Proportional to 21,273.78, 31,910.67 and 5,691

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Solution

The fourth proportional to 21,273.78, 31,910.67 and 5,691 is: 8,536.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,273.78 : 31,910.67 = 5,691 : x
  2. Step 2: Convert to fraction form
    21,273.78/31,910.67 = 5,691/x
  3. Step 3: Cross multiply
    21,273.78x = 31,910.67 × 5,691
  4. Step 4: Simplify right side
    21,273.78x = 181,603,622.97
  5. Step 5: Solve for x
    x = 181,603,622.97/21,273.78
  6. Step 6: Final answer
    x = 8,536.50

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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.