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Finding the Fourth Proportional to 390,067.20, 585,446.40 and 200,661.12

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Solution

The fourth proportional to 390,067.20, 585,446.40 and 200,661.12 is: 301,169.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,067.20 : 585,446.40 = 200,661.12 : x
  2. Step 2: Convert to fraction form
    390,067.20/585,446.40 = 200,661.12/x
  3. Step 3: Cross multiply
    390,067.20x = 585,446.40 × 200,661.12
  4. Step 4: Simplify right side
    390,067.20x = 117,476,330,323.97
  5. Step 5: Solve for x
    x = 117,476,330,323.97/390,067.20
  6. Step 6: Final answer
    x = 301,169.47

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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.