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Finding the Fourth Proportional to 391,859.85, 540,772.52 and 219,815.95

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Solution

The fourth proportional to 391,859.85, 540,772.52 and 219,815.95 is: 303,349.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,859.85 : 540,772.52 = 219,815.95 : x
  2. Step 2: Convert to fraction form
    391,859.85/540,772.52 = 219,815.95/x
  3. Step 3: Cross multiply
    391,859.85x = 540,772.52 × 219,815.95
  4. Step 4: Simplify right side
    391,859.85x = 118,870,425,217.69
  5. Step 5: Solve for x
    x = 118,870,425,217.69/391,859.85
  6. Step 6: Final answer
    x = 303,349.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.