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Finding the Fourth Proportional to 420,422.58, 580,195.98 and 239,160.78

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Solution

The fourth proportional to 420,422.58, 580,195.98 and 239,160.78 is: 330,049.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,422.58 : 580,195.98 = 239,160.78 : x
  2. Step 2: Convert to fraction form
    420,422.58/580,195.98 = 239,160.78/x
  3. Step 3: Cross multiply
    420,422.58x = 580,195.98 × 239,160.78
  4. Step 4: Simplify right side
    420,422.58x = 138,760,123,129.66
  5. Step 5: Solve for x
    x = 138,760,123,129.66/420,422.58
  6. Step 6: Final answer
    x = 330,049.17

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1.5x scale

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.