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Finding the Fourth Proportional to 399,279.23, 551,013.13 and 217,991.62

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Solution

The fourth proportional to 399,279.23, 551,013.13 and 217,991.62 is: 300,832.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,279.23 : 551,013.13 = 217,991.62 : x
  2. Step 2: Convert to fraction form
    399,279.23/551,013.13 = 217,991.62/x
  3. Step 3: Cross multiply
    399,279.23x = 551,013.13 × 217,991.62
  4. Step 4: Simplify right side
    399,279.23x = 120,116,244,849.97
  5. Step 5: Solve for x
    x = 120,116,244,849.97/399,279.23
  6. Step 6: Final answer
    x = 300,832.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.