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Finding the Fourth Proportional to 420,659.42, 631,067.56 and 136,324.62

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Solution

The fourth proportional to 420,659.42, 631,067.56 and 136,324.62 is: 204,512.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,659.42 : 631,067.56 = 136,324.62 : x
  2. Step 2: Convert to fraction form
    420,659.42/631,067.56 = 136,324.62/x
  3. Step 3: Cross multiply
    420,659.42x = 631,067.56 × 136,324.62
  4. Step 4: Simplify right side
    420,659.42x = 86,030,044,970.52
  5. Step 5: Solve for x
    x = 86,030,044,970.52/420,659.42
  6. Step 6: Final answer
    x = 204,512.35

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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.