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Finding the Fourth Proportional to 172,548.60, 258,735.38 and 78,974.20

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Solution

The fourth proportional to 172,548.60, 258,735.38 and 78,974.20 is: 118,421.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,548.60 : 258,735.38 = 78,974.20 : x
  2. Step 2: Convert to fraction form
    172,548.60/258,735.38 = 78,974.20/x
  3. Step 3: Cross multiply
    172,548.60x = 258,735.38 × 78,974.20
  4. Step 4: Simplify right side
    172,548.60x = 20,433,419,647.20
  5. Step 5: Solve for x
    x = 20,433,419,647.20/172,548.60
  6. Step 6: Final answer
    x = 118,421.24

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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.