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Finding the Fourth Proportional to 218,755.69, 328,122.56 and 85,660.34

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Solution

The fourth proportional to 218,755.69, 328,122.56 and 85,660.34 is: 128,486.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,755.69 : 328,122.56 = 85,660.34 : x
  2. Step 2: Convert to fraction form
    218,755.69/328,122.56 = 85,660.34/x
  3. Step 3: Cross multiply
    218,755.69x = 328,122.56 × 85,660.34
  4. Step 4: Simplify right side
    218,755.69x = 28,107,088,624.81
  5. Step 5: Solve for x
    x = 28,107,088,624.81/218,755.69
  6. Step 6: Final answer
    x = 128,486.21

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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.