Home / 11,115.59-15,324.51-7,129.79

Finding the Fourth Proportional to 11,115.59, 15,324.51 and 7,129.79

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Solution

The fourth proportional to 11,115.59, 15,324.51 and 7,129.79 is: 9,829.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,115.59 : 15,324.51 = 7,129.79 : x
  2. Step 2: Convert to fraction form
    11,115.59/15,324.51 = 7,129.79/x
  3. Step 3: Cross multiply
    11,115.59x = 15,324.51 × 7,129.79
  4. Step 4: Simplify right side
    11,115.59x = 109,260,425.88
  5. Step 5: Solve for x
    x = 109,260,425.88/11,115.59
  6. Step 6: Final answer
    x = 9,829.48

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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.