Home / 81,321.72-121,386.96-71,734.56

Finding the Fourth Proportional to 81,321.72, 121,386.96 and 71,734.56

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Solution

The fourth proportional to 81,321.72, 121,386.96 and 71,734.56 is: 107,076.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,321.72 : 121,386.96 = 71,734.56 : x
  2. Step 2: Convert to fraction form
    81,321.72/121,386.96 = 71,734.56/x
  3. Step 3: Cross multiply
    81,321.72x = 121,386.96 × 71,734.56
  4. Step 4: Simplify right side
    81,321.72x = 8,707,640,165.34
  5. Step 5: Solve for x
    x = 8,707,640,165.34/81,321.72
  6. Step 6: Final answer
    x = 107,076.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.