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Finding the Fourth Proportional to 78,706.62, 118,028.61 and 28,775.34

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Solution

The fourth proportional to 78,706.62, 118,028.61 and 28,775.34 is: 43,151.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,706.62 : 118,028.61 = 28,775.34 : x
  2. Step 2: Convert to fraction form
    78,706.62/118,028.61 = 28,775.34/x
  3. Step 3: Cross multiply
    78,706.62x = 118,028.61 × 28,775.34
  4. Step 4: Simplify right side
    78,706.62x = 3,396,313,382.48
  5. Step 5: Solve for x
    x = 3,396,313,382.48/78,706.62
  6. Step 6: Final answer
    x = 43,151.56

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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.