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Finding the Fourth Proportional to 386,217.67, 579,486.38 and 208,515.69

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Solution

The fourth proportional to 386,217.67, 579,486.38 and 208,515.69 is: 312,859.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,217.67 : 579,486.38 = 208,515.69 : x
  2. Step 2: Convert to fraction form
    386,217.67/579,486.38 = 208,515.69/x
  3. Step 3: Cross multiply
    386,217.67x = 579,486.38 × 208,515.69
  4. Step 4: Simplify right side
    386,217.67x = 120,832,002,371.30
  5. Step 5: Solve for x
    x = 120,832,002,371.30/386,217.67
  6. Step 6: Final answer
    x = 312,859.85

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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.