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Finding the Fourth Proportional to 400.43, 551.49 and 345.15

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Solution

The fourth proportional to 400.43, 551.49 and 345.15 is: 475.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.43 : 551.49 = 345.15 : x
  2. Step 2: Convert to fraction form
    400.43/551.49 = 345.15/x
  3. Step 3: Cross multiply
    400.43x = 551.49 × 345.15
  4. Step 4: Simplify right side
    400.43x = 190,348.07
  5. Step 5: Solve for x
    x = 190,348.07/400.43
  6. Step 6: Final answer
    x = 475.36

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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.