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Finding the Fourth Proportional to 420,694.88, 631,042.32 and 125,206.88

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Solution

The fourth proportional to 420,694.88, 631,042.32 and 125,206.88 is: 187,810.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,694.88 : 631,042.32 = 125,206.88 : x
  2. Step 2: Convert to fraction form
    420,694.88/631,042.32 = 125,206.88/x
  3. Step 3: Cross multiply
    420,694.88x = 631,042.32 × 125,206.88
  4. Step 4: Simplify right side
    420,694.88x = 79,010,836,879.95
  5. Step 5: Solve for x
    x = 79,010,836,879.95/420,694.88
  6. Step 6: Final answer
    x = 187,810.31

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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.