Home / 21,380.74-29,505.49-12,428.42

Finding the Fourth Proportional to 21,380.74, 29,505.49 and 12,428.42

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Solution

The fourth proportional to 21,380.74, 29,505.49 and 12,428.42 is: 17,151.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,380.74 : 29,505.49 = 12,428.42 : x
  2. Step 2: Convert to fraction form
    21,380.74/29,505.49 = 12,428.42/x
  3. Step 3: Cross multiply
    21,380.74x = 29,505.49 × 12,428.42
  4. Step 4: Simplify right side
    21,380.74x = 366,706,622.03
  5. Step 5: Solve for x
    x = 366,706,622.03/21,380.74
  6. Step 6: Final answer
    x = 17,151.26

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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.