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Finding the Fourth Proportional to 425,486.80, 638,521.80 and 188,999.20

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Solution

The fourth proportional to 425,486.80, 638,521.80 and 188,999.20 is: 283,628.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,486.80 : 638,521.80 = 188,999.20 : x
  2. Step 2: Convert to fraction form
    425,486.80/638,521.80 = 188,999.20/x
  3. Step 3: Cross multiply
    425,486.80x = 638,521.80 × 188,999.20
  4. Step 4: Simplify right side
    425,486.80x = 120,680,109,382.56
  5. Step 5: Solve for x
    x = 120,680,109,382.56/425,486.80
  6. Step 6: Final answer
    x = 283,628.33

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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.