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Finding the Fourth Proportional to 385,067.72, 531,391.72 and 215,301.85

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Solution

The fourth proportional to 385,067.72, 531,391.72 and 215,301.85 is: 297,115.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,067.72 : 531,391.72 = 215,301.85 : x
  2. Step 2: Convert to fraction form
    385,067.72/531,391.72 = 215,301.85/x
  3. Step 3: Cross multiply
    385,067.72x = 531,391.72 × 215,301.85
  4. Step 4: Simplify right side
    385,067.72x = 114,409,620,390.68
  5. Step 5: Solve for x
    x = 114,409,620,390.68/385,067.72
  6. Step 6: Final answer
    x = 297,115.58

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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.