Home / 12,420.73-17,141.21-7,115.56

Finding the Fourth Proportional to 12,420.73, 17,141.21 and 7,115.56

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Solution

The fourth proportional to 12,420.73, 17,141.21 and 7,115.56 is: 9,819.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.73 : 17,141.21 = 7,115.56 : x
  2. Step 2: Convert to fraction form
    12,420.73/17,141.21 = 7,115.56/x
  3. Step 3: Cross multiply
    12,420.73x = 17,141.21 × 7,115.56
  4. Step 4: Simplify right side
    12,420.73x = 121,969,308.23
  5. Step 5: Solve for x
    x = 121,969,308.23/12,420.73
  6. Step 6: Final answer
    x = 9,819.82

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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.