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Finding the Fourth Proportional to 400.60, 551.10 and 393.04

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Solution

The fourth proportional to 400.60, 551.10 and 393.04 is: 540.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.60 : 551.10 = 393.04 : x
  2. Step 2: Convert to fraction form
    400.60/551.10 = 393.04/x
  3. Step 3: Cross multiply
    400.60x = 551.10 × 393.04
  4. Step 4: Simplify right side
    400.60x = 216,604.34
  5. Step 5: Solve for x
    x = 216,604.34/400.60
  6. Step 6: Final answer
    x = 540.70

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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.