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Finding the Fourth Proportional to 84,493.44, 126,134.78 and 78,588.54

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Solution

The fourth proportional to 84,493.44, 126,134.78 and 78,588.54 is: 117,319.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,493.44 : 126,134.78 = 78,588.54 : x
  2. Step 2: Convert to fraction form
    84,493.44/126,134.78 = 78,588.54/x
  3. Step 3: Cross multiply
    84,493.44x = 126,134.78 × 78,588.54
  4. Step 4: Simplify right side
    84,493.44x = 9,912,747,810.48
  5. Step 5: Solve for x
    x = 9,912,747,810.48/84,493.44
  6. Step 6: Final answer
    x = 117,319.73

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.