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Finding the Fourth Proportional to 78,951.87, 108,961.20 and 43,147.31

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Solution

The fourth proportional to 78,951.87, 108,961.20 and 43,147.31 is: 59,547.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,951.87 : 108,961.20 = 43,147.31 : x
  2. Step 2: Convert to fraction form
    78,951.87/108,961.20 = 43,147.31/x
  3. Step 3: Cross multiply
    78,951.87x = 108,961.20 × 43,147.31
  4. Step 4: Simplify right side
    78,951.87x = 4,701,382,129.57
  5. Step 5: Solve for x
    x = 4,701,382,129.57/78,951.87
  6. Step 6: Final answer
    x = 59,547.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.