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Finding the Fourth Proportional to 126,806.28, 189,929.06 and 86,730.28

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Solution

The fourth proportional to 126,806.28, 189,929.06 and 86,730.28 is: 129,903.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,806.28 : 189,929.06 = 86,730.28 : x
  2. Step 2: Convert to fraction form
    126,806.28/189,929.06 = 86,730.28/x
  3. Step 3: Cross multiply
    126,806.28x = 189,929.06 × 86,730.28
  4. Step 4: Simplify right side
    126,806.28x = 16,472,600,553.94
  5. Step 5: Solve for x
    x = 16,472,600,553.94/126,806.28
  6. Step 6: Final answer
    x = 129,903.67

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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.