Home / 21,121.75-29,148.10-13,568.15

Finding the Fourth Proportional to 21,121.75, 29,148.10 and 13,568.15

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Solution

The fourth proportional to 21,121.75, 29,148.10 and 13,568.15 is: 18,724.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.75 : 29,148.10 = 13,568.15 : x
  2. Step 2: Convert to fraction form
    21,121.75/29,148.10 = 13,568.15/x
  3. Step 3: Cross multiply
    21,121.75x = 29,148.10 × 13,568.15
  4. Step 4: Simplify right side
    21,121.75x = 395,485,801.93
  5. Step 5: Solve for x
    x = 395,485,801.93/21,121.75
  6. Step 6: Final answer
    x = 18,724.10

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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.