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Finding the Fourth Proportional to 386,913.20, 580,830.60 and 218,567.60

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Solution

The fourth proportional to 386,913.20, 580,830.60 and 218,567.60 is: 328,111.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,913.20 : 580,830.60 = 218,567.60 : x
  2. Step 2: Convert to fraction form
    386,913.20/580,830.60 = 218,567.60/x
  3. Step 3: Cross multiply
    386,913.20x = 580,830.60 × 218,567.60
  4. Step 4: Simplify right side
    386,913.20x = 126,950,750,248.56
  5. Step 5: Solve for x
    x = 126,950,750,248.56/386,913.20
  6. Step 6: Final answer
    x = 328,111.71

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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.