Home / 126,014.40-189,021.60-81,691.20

Finding the Fourth Proportional to 126,014.40, 189,021.60 and 81,691.20

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Solution

The fourth proportional to 126,014.40, 189,021.60 and 81,691.20 is: 122,536.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,014.40 : 189,021.60 = 81,691.20 : x
  2. Step 2: Convert to fraction form
    126,014.40/189,021.60 = 81,691.20/x
  3. Step 3: Cross multiply
    126,014.40x = 189,021.60 × 81,691.20
  4. Step 4: Simplify right side
    126,014.40x = 15,441,401,329.92
  5. Step 5: Solve for x
    x = 15,441,401,329.92/126,014.40
  6. Step 6: Final answer
    x = 122,536.80

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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.