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Finding the Fourth Proportional to 425,858.50, 638,895.75 and 159,619.78

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Solution

The fourth proportional to 425,858.50, 638,895.75 and 159,619.78 is: 239,470.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,858.50 : 638,895.75 = 159,619.78 : x
  2. Step 2: Convert to fraction form
    425,858.50/638,895.75 = 159,619.78/x
  3. Step 3: Cross multiply
    425,858.50x = 638,895.75 × 159,619.78
  4. Step 4: Simplify right side
    425,858.50x = 101,980,399,057.94
  5. Step 5: Solve for x
    x = 101,980,399,057.94/425,858.50
  6. Step 6: Final answer
    x = 239,470.15

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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.