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Finding the Fourth Proportional to 425,856.50, 638,892.75 and 159,617.78

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Solution

The fourth proportional to 425,856.50, 638,892.75 and 159,617.78 is: 239,467.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,856.50 : 638,892.75 = 159,617.78 : x
  2. Step 2: Convert to fraction form
    425,856.50/638,892.75 = 159,617.78/x
  3. Step 3: Cross multiply
    425,856.50x = 638,892.75 × 159,617.78
  4. Step 4: Simplify right side
    425,856.50x = 101,978,642,413.10
  5. Step 5: Solve for x
    x = 101,978,642,413.10/425,856.50
  6. Step 6: Final answer
    x = 239,467.15

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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.