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Finding the Fourth Proportional to 21,571.84, 29,766.20 and 12,620.80

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Solution

The fourth proportional to 21,571.84, 29,766.20 and 12,620.80 is: 17,414.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,571.84 : 29,766.20 = 12,620.80 : x
  2. Step 2: Convert to fraction form
    21,571.84/29,766.20 = 12,620.80/x
  3. Step 3: Cross multiply
    21,571.84x = 29,766.20 × 12,620.80
  4. Step 4: Simplify right side
    21,571.84x = 375,673,256.96
  5. Step 5: Solve for x
    x = 375,673,256.96/21,571.84
  6. Step 6: Final answer
    x = 17,414.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.