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Finding the Fourth Proportional to 172,351.20, 258,440.40 and 78,751.20

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Solution

The fourth proportional to 172,351.20, 258,440.40 and 78,751.20 is: 118,087.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,351.20 : 258,440.40 = 78,751.20 : x
  2. Step 2: Convert to fraction form
    172,351.20/258,440.40 = 78,751.20/x
  3. Step 3: Cross multiply
    172,351.20x = 258,440.40 × 78,751.20
  4. Step 4: Simplify right side
    172,351.20x = 20,352,491,628.48
  5. Step 5: Solve for x
    x = 20,352,491,628.48/172,351.20
  6. Step 6: Final answer
    x = 118,087.32

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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.