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Finding the Fourth Proportional to 78,469.44, 108,286.54 and 42,660.34

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Solution

The fourth proportional to 78,469.44, 108,286.54 and 42,660.34 is: 58,870.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,469.44 : 108,286.54 = 42,660.34 : x
  2. Step 2: Convert to fraction form
    78,469.44/108,286.54 = 42,660.34/x
  3. Step 3: Cross multiply
    78,469.44x = 108,286.54 × 42,660.34
  4. Step 4: Simplify right side
    78,469.44x = 4,619,540,613.82
  5. Step 5: Solve for x
    x = 4,619,540,613.82/78,469.44
  6. Step 6: Final answer
    x = 58,870.57

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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.