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Finding the Fourth Proportional to 1,331.42, 1,997.13 and 551.86

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Solution

The fourth proportional to 1,331.42, 1,997.13 and 551.86 is: 827.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.42 : 1,997.13 = 551.86 : x
  2. Step 2: Convert to fraction form
    1,331.42/1,997.13 = 551.86/x
  3. Step 3: Cross multiply
    1,331.42x = 1,997.13 × 551.86
  4. Step 4: Simplify right side
    1,331.42x = 1,102,136.16
  5. Step 5: Solve for x
    x = 1,102,136.16/1,331.42
  6. Step 6: Final answer
    x = 827.79

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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.