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Finding the Fourth Proportional to 219,767.28, 329,786.28 and 86,624.88

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Solution

The fourth proportional to 219,767.28, 329,786.28 and 86,624.88 is: 129,990.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,767.28 : 329,786.28 = 86,624.88 : x
  2. Step 2: Convert to fraction form
    219,767.28/329,786.28 = 86,624.88/x
  3. Step 3: Cross multiply
    219,767.28x = 329,786.28 × 86,624.88
  4. Step 4: Simplify right side
    219,767.28x = 28,567,696,930.65
  5. Step 5: Solve for x
    x = 28,567,696,930.65/219,767.28
  6. Step 6: Final answer
    x = 129,990.67

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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.