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Finding the Fourth Proportional to 84,018.64, 126,040.74 and 28,601.68

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Solution

The fourth proportional to 84,018.64, 126,040.74 and 28,601.68 is: 42,906.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,018.64 : 126,040.74 = 28,601.68 : x
  2. Step 2: Convert to fraction form
    84,018.64/126,040.74 = 28,601.68/x
  3. Step 3: Cross multiply
    84,018.64x = 126,040.74 × 28,601.68
  4. Step 4: Simplify right side
    84,018.64x = 3,604,976,912.44
  5. Step 5: Solve for x
    x = 3,604,976,912.44/84,018.64
  6. Step 6: Final answer
    x = 42,906.87

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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.