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Finding the Fourth Proportional to 21,631, 32,435.88 and 8,479.84

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Solution

The fourth proportional to 21,631, 32,435.88 and 8,479.84 is: 12,715.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,631 : 32,435.88 = 8,479.84 : x
  2. Step 2: Convert to fraction form
    21,631/32,435.88 = 8,479.84/x
  3. Step 3: Cross multiply
    21,631x = 32,435.88 × 8,479.84
  4. Step 4: Simplify right side
    21,631x = 275,051,072.66
  5. Step 5: Solve for x
    x = 275,051,072.66/21,631
  6. Step 6: Final answer
    x = 12,715.60

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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.