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Finding the Fourth Proportional to 218,879.10, 328,318.65 and 61,107.30

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Solution

The fourth proportional to 218,879.10, 328,318.65 and 61,107.30 is: 91,660.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,879.10 : 328,318.65 = 61,107.30 : x
  2. Step 2: Convert to fraction form
    218,879.10/328,318.65 = 61,107.30/x
  3. Step 3: Cross multiply
    218,879.10x = 328,318.65 × 61,107.30
  4. Step 4: Simplify right side
    218,879.10x = 20,062,666,241.15
  5. Step 5: Solve for x
    x = 20,062,666,241.15/218,879.10
  6. Step 6: Final answer
    x = 91,660.95

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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.