Home / 428,997.27-643,705.80-172,819.18

Finding the Fourth Proportional to 428,997.27, 643,705.80 and 172,819.18

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Solution

The fourth proportional to 428,997.27, 643,705.80 and 172,819.18 is: 259,313.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,997.27 : 643,705.80 = 172,819.18 : x
  2. Step 2: Convert to fraction form
    428,997.27/643,705.80 = 172,819.18/x
  3. Step 3: Cross multiply
    428,997.27x = 643,705.80 × 172,819.18
  4. Step 4: Simplify right side
    428,997.27x = 111,244,708,878.93
  5. Step 5: Solve for x
    x = 111,244,708,878.93/428,997.27
  6. Step 6: Final answer
    x = 259,313.33

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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.