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Finding the Fourth Proportional to 172,540.08, 258,722.04 and 78,965.60

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Solution

The fourth proportional to 172,540.08, 258,722.04 and 78,965.60 is: 118,408.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,540.08 : 258,722.04 = 78,965.60 : x
  2. Step 2: Convert to fraction form
    172,540.08/258,722.04 = 78,965.60/x
  3. Step 3: Cross multiply
    172,540.08x = 258,722.04 × 78,965.60
  4. Step 4: Simplify right side
    172,540.08x = 20,430,141,121.82
  5. Step 5: Solve for x
    x = 20,430,141,121.82/172,540.08
  6. Step 6: Final answer
    x = 118,408.09

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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.