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Finding the Fourth Proportional to 21,331.20, 29,824.80 and 21,331.20

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Solution

The fourth proportional to 21,331.20, 29,824.80 and 21,331.20 is: 29,824.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,331.20 : 29,824.80 = 21,331.20 : x
  2. Step 2: Convert to fraction form
    21,331.20/29,824.80 = 21,331.20/x
  3. Step 3: Cross multiply
    21,331.20x = 29,824.80 × 21,331.20
  4. Step 4: Simplify right side
    21,331.20x = 636,198,773.76
  5. Step 5: Solve for x
    x = 636,198,773.76/21,331.20
  6. Step 6: Final answer
    x = 29,824.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.