Home / 81,335.63-121,449.87-71,768.21

Finding the Fourth Proportional to 81,335.63, 121,449.87 and 71,768.21

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Solution

The fourth proportional to 81,335.63, 121,449.87 and 71,768.21 is: 107,163.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,335.63 : 121,449.87 = 71,768.21 : x
  2. Step 2: Convert to fraction form
    81,335.63/121,449.87 = 71,768.21/x
  3. Step 3: Cross multiply
    81,335.63x = 121,449.87 × 71,768.21
  4. Step 4: Simplify right side
    81,335.63x = 8,716,239,167.38
  5. Step 5: Solve for x
    x = 8,716,239,167.38/81,335.63
  6. Step 6: Final answer
    x = 107,163.85

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1.5x scale

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.