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Finding the Fourth Proportional to 425,905.43, 638,227.01 and 172,878.03

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Solution

The fourth proportional to 425,905.43, 638,227.01 and 172,878.03 is: 259,060.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,905.43 : 638,227.01 = 172,878.03 : x
  2. Step 2: Convert to fraction form
    425,905.43/638,227.01 = 172,878.03/x
  3. Step 3: Cross multiply
    425,905.43x = 638,227.01 × 172,878.03
  4. Step 4: Simplify right side
    425,905.43x = 110,335,427,317.20
  5. Step 5: Solve for x
    x = 110,335,427,317.20/425,905.43
  6. Step 6: Final answer
    x = 259,060.86

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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.