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Finding the Fourth Proportional to 218,778.48, 328,163.88 and 61,015.92

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Solution

The fourth proportional to 218,778.48, 328,163.88 and 61,015.92 is: 91,522.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,778.48 : 328,163.88 = 61,015.92 : x
  2. Step 2: Convert to fraction form
    218,778.48/328,163.88 = 61,015.92/x
  3. Step 3: Cross multiply
    218,778.48x = 328,163.88 × 61,015.92
  4. Step 4: Simplify right side
    218,778.48x = 20,023,221,048.97
  5. Step 5: Solve for x
    x = 20,023,221,048.97/218,778.48
  6. Step 6: Final answer
    x = 91,522.81

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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.