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Finding the Fourth Proportional to 386,645.40, 580,115.93 and 218,355.75

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Solution

The fourth proportional to 386,645.40, 580,115.93 and 218,355.75 is: 327,617.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,645.40 : 580,115.93 = 218,355.75 : x
  2. Step 2: Convert to fraction form
    386,645.40/580,115.93 = 218,355.75/x
  3. Step 3: Cross multiply
    386,645.40x = 580,115.93 × 218,355.75
  4. Step 4: Simplify right side
    386,645.40x = 126,671,647,890.32
  5. Step 5: Solve for x
    x = 126,671,647,890.32/386,645.40
  6. Step 6: Final answer
    x = 327,617.11

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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.