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Finding the Fourth Proportional to 378,489.88, 522,301.38 and 215,167.79

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Solution

The fourth proportional to 378,489.88, 522,301.38 and 215,167.79 is: 296,923.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,489.88 : 522,301.38 = 215,167.79 : x
  2. Step 2: Convert to fraction form
    378,489.88/522,301.38 = 215,167.79/x
  3. Step 3: Cross multiply
    378,489.88x = 522,301.38 × 215,167.79
  4. Step 4: Simplify right side
    378,489.88x = 112,382,434,147.42
  5. Step 5: Solve for x
    x = 112,382,434,147.42/378,489.88
  6. Step 6: Final answer
    x = 296,923.22

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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.