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Finding the Fourth Proportional to 218,910.72, 328,382.28 and 78,670.56

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Solution

The fourth proportional to 218,910.72, 328,382.28 and 78,670.56 is: 118,011.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,910.72 : 328,382.28 = 78,670.56 : x
  2. Step 2: Convert to fraction form
    218,910.72/328,382.28 = 78,670.56/x
  3. Step 3: Cross multiply
    218,910.72x = 328,382.28 × 78,670.56
  4. Step 4: Simplify right side
    218,910.72x = 25,834,017,861.68
  5. Step 5: Solve for x
    x = 25,834,017,861.68/218,910.72
  6. Step 6: Final answer
    x = 118,011.66

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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.