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Finding the Fourth Proportional to 172,370.80, 258,556.20 and 72,643.60

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Solution

The fourth proportional to 172,370.80, 258,556.20 and 72,643.60 is: 108,965.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,370.80 : 258,556.20 = 72,643.60 : x
  2. Step 2: Convert to fraction form
    172,370.80/258,556.20 = 72,643.60/x
  3. Step 3: Cross multiply
    172,370.80x = 258,556.20 × 72,643.60
  4. Step 4: Simplify right side
    172,370.80x = 18,782,453,170.32
  5. Step 5: Solve for x
    x = 18,782,453,170.32/172,370.80
  6. Step 6: Final answer
    x = 108,965.40

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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.