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Finding the Fourth Proportional to 172,631.80, 258,510.30 and 137,639.80

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Solution

The fourth proportional to 172,631.80, 258,510.30 and 137,639.80 is: 206,110.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,631.80 : 258,510.30 = 137,639.80 : x
  2. Step 2: Convert to fraction form
    172,631.80/258,510.30 = 137,639.80/x
  3. Step 3: Cross multiply
    172,631.80x = 258,510.30 × 137,639.80
  4. Step 4: Simplify right side
    172,631.80x = 35,581,305,989.94
  5. Step 5: Solve for x
    x = 35,581,305,989.94/172,631.80
  6. Step 6: Final answer
    x = 206,110.96

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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.