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Finding the Fourth Proportional to 21,631, 32,446.50 and 5,215

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Solution

The fourth proportional to 21,631, 32,446.50 and 5,215 is: 7,822.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,631 : 32,446.50 = 5,215 : x
  2. Step 2: Convert to fraction form
    21,631/32,446.50 = 5,215/x
  3. Step 3: Cross multiply
    21,631x = 32,446.50 × 5,215
  4. Step 4: Simplify right side
    21,631x = 169,208,497.50
  5. Step 5: Solve for x
    x = 169,208,497.50/21,631
  6. Step 6: Final answer
    x = 7,822.50

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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.