Home / 21,380.73-29,500.38-12,880.59

Finding the Fourth Proportional to 21,380.73, 29,500.38 and 12,880.59

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Solution

The fourth proportional to 21,380.73, 29,500.38 and 12,880.59 is: 17,772.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,380.73 : 29,500.38 = 12,880.59 : x
  2. Step 2: Convert to fraction form
    21,380.73/29,500.38 = 12,880.59/x
  3. Step 3: Cross multiply
    21,380.73x = 29,500.38 × 12,880.59
  4. Step 4: Simplify right side
    21,380.73x = 379,982,299.62
  5. Step 5: Solve for x
    x = 379,982,299.62/21,380.73
  6. Step 6: Final answer
    x = 17,772.19

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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.