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Finding the Fourth Proportional to 207,871.80, 311,370.30 and 172,879.80

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Solution

The fourth proportional to 207,871.80, 311,370.30 and 172,879.80 is: 258,955.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,871.80 : 311,370.30 = 172,879.80 : x
  2. Step 2: Convert to fraction form
    207,871.80/311,370.30 = 172,879.80/x
  3. Step 3: Cross multiply
    207,871.80x = 311,370.30 × 172,879.80
  4. Step 4: Simplify right side
    207,871.80x = 53,829,635,189.94
  5. Step 5: Solve for x
    x = 53,829,635,189.94/207,871.80
  6. Step 6: Final answer
    x = 258,955.93

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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.