Home / 81,144.10-121,745.31-71,404.66

Finding the Fourth Proportional to 81,144.10, 121,745.31 and 71,404.66

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Solution

The fourth proportional to 81,144.10, 121,745.31 and 71,404.66 is: 107,132.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,144.10 : 121,745.31 = 71,404.66 : x
  2. Step 2: Convert to fraction form
    81,144.10/121,745.31 = 71,404.66/x
  3. Step 3: Cross multiply
    81,144.10x = 121,745.31 × 71,404.66
  4. Step 4: Simplify right side
    81,144.10x = 8,693,182,467.14
  5. Step 5: Solve for x
    x = 8,693,182,467.14/81,144.10
  6. Step 6: Final answer
    x = 107,132.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.