Home / 21,121.41-29,147.55-11,561.31

Finding the Fourth Proportional to 21,121.41, 29,147.55 and 11,561.31

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Solution

The fourth proportional to 21,121.41, 29,147.55 and 11,561.31 is: 15,954.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.41 : 29,147.55 = 11,561.31 : x
  2. Step 2: Convert to fraction form
    21,121.41/29,147.55 = 11,561.31/x
  3. Step 3: Cross multiply
    21,121.41x = 29,147.55 × 11,561.31
  4. Step 4: Simplify right side
    21,121.41x = 336,983,861.29
  5. Step 5: Solve for x
    x = 336,983,861.29/21,121.41
  6. Step 6: Final answer
    x = 15,954.61

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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.