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Finding the Fourth Proportional to 172,391.55, 258,107.40 and 87,969.30

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Solution

The fourth proportional to 172,391.55, 258,107.40 and 87,969.30 is: 131,709.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,391.55 : 258,107.40 = 87,969.30 : x
  2. Step 2: Convert to fraction form
    172,391.55/258,107.40 = 87,969.30/x
  3. Step 3: Cross multiply
    172,391.55x = 258,107.40 × 87,969.30
  4. Step 4: Simplify right side
    172,391.55x = 22,705,527,302.82
  5. Step 5: Solve for x
    x = 22,705,527,302.82/172,391.55
  6. Step 6: Final answer
    x = 131,709.05

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1.5x scale

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.