Home / 11,389.89-15,719.78-6,912.78

Finding the Fourth Proportional to 11,389.89, 15,719.78 and 6,912.78

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Solution

The fourth proportional to 11,389.89, 15,719.78 and 6,912.78 is: 9,540.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,389.89 : 15,719.78 = 6,912.78 : x
  2. Step 2: Convert to fraction form
    11,389.89/15,719.78 = 6,912.78/x
  3. Step 3: Cross multiply
    11,389.89x = 15,719.78 × 6,912.78
  4. Step 4: Simplify right side
    11,389.89x = 108,667,398.07
  5. Step 5: Solve for x
    x = 108,667,398.07/11,389.89
  6. Step 6: Final answer
    x = 9,540.69

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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.