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Finding the Fourth Proportional to 28,706.38, 43,059.56 and 7,929.88

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Solution

The fourth proportional to 28,706.38, 43,059.56 and 7,929.88 is: 11,894.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,706.38 : 43,059.56 = 7,929.88 : x
  2. Step 2: Convert to fraction form
    28,706.38/43,059.56 = 7,929.88/x
  3. Step 3: Cross multiply
    28,706.38x = 43,059.56 × 7,929.88
  4. Step 4: Simplify right side
    28,706.38x = 341,457,143.65
  5. Step 5: Solve for x
    x = 341,457,143.65/28,706.38
  6. Step 6: Final answer
    x = 11,894.82

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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.