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Finding the Fourth Proportional to 399,014.70, 550,653.55 and 217,736.57

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Solution

The fourth proportional to 399,014.70, 550,653.55 and 217,736.57 is: 300,483.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,014.70 : 550,653.55 = 217,736.57 : x
  2. Step 2: Convert to fraction form
    399,014.70/550,653.55 = 217,736.57/x
  3. Step 3: Cross multiply
    399,014.70x = 550,653.55 × 217,736.57
  4. Step 4: Simplify right side
    399,014.70x = 119,897,416,067.62
  5. Step 5: Solve for x
    x = 119,897,416,067.62/399,014.70
  6. Step 6: Final answer
    x = 300,483.71

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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.