Home / 12,427.70-17,149.25-7,121.39

Finding the Fourth Proportional to 12,427.70, 17,149.25 and 7,121.39

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Solution

The fourth proportional to 12,427.70, 17,149.25 and 7,121.39 is: 9,826.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,427.70 : 17,149.25 = 7,121.39 : x
  2. Step 2: Convert to fraction form
    12,427.70/17,149.25 = 7,121.39/x
  3. Step 3: Cross multiply
    12,427.70x = 17,149.25 × 7,121.39
  4. Step 4: Simplify right side
    12,427.70x = 122,126,429.51
  5. Step 5: Solve for x
    x = 122,126,429.51/12,427.70
  6. Step 6: Final answer
    x = 9,826.96

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Double scale
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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.