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Finding the Fourth Proportional to 21,217, 31,825.50 and 6,625

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Solution

The fourth proportional to 21,217, 31,825.50 and 6,625 is: 9,937.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,217 : 31,825.50 = 6,625 : x
  2. Step 2: Convert to fraction form
    21,217/31,825.50 = 6,625/x
  3. Step 3: Cross multiply
    21,217x = 31,825.50 × 6,625
  4. Step 4: Simplify right side
    21,217x = 210,843,937.50
  5. Step 5: Solve for x
    x = 210,843,937.50/21,217
  6. Step 6: Final answer
    x = 9,937.50

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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.