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Finding the Fourth Proportional to 425,610.60, 638,415.90 and 172,890.60

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Solution

The fourth proportional to 425,610.60, 638,415.90 and 172,890.60 is: 259,335.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,610.60 : 638,415.90 = 172,890.60 : x
  2. Step 2: Convert to fraction form
    425,610.60/638,415.90 = 172,890.60/x
  3. Step 3: Cross multiply
    425,610.60x = 638,415.90 × 172,890.60
  4. Step 4: Simplify right side
    425,610.60x = 110,376,108,000.54
  5. Step 5: Solve for x
    x = 110,376,108,000.54/425,610.60
  6. Step 6: Final answer
    x = 259,335.90

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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.