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Finding the Fourth Proportional to 78,701.39, 108,608 and 42,891.43

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Solution

The fourth proportional to 78,701.39, 108,608 and 42,891.43 is: 59,190.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,701.39 : 108,608 = 42,891.43 : x
  2. Step 2: Convert to fraction form
    78,701.39/108,608 = 42,891.43/x
  3. Step 3: Cross multiply
    78,701.39x = 108,608 × 42,891.43
  4. Step 4: Simplify right side
    78,701.39x = 4,658,352,429.44
  5. Step 5: Solve for x
    x = 4,658,352,429.44/78,701.39
  6. Step 6: Final answer
    x = 59,190.22

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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.