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Finding the Fourth Proportional to 400.98, 551.99 and 347.79

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Solution

The fourth proportional to 400.98, 551.99 and 347.79 is: 478.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.98 : 551.99 = 347.79 : x
  2. Step 2: Convert to fraction form
    400.98/551.99 = 347.79/x
  3. Step 3: Cross multiply
    400.98x = 551.99 × 347.79
  4. Step 4: Simplify right side
    400.98x = 191,978.56
  5. Step 5: Solve for x
    x = 191,978.56/400.98
  6. Step 6: Final answer
    x = 478.78

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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.