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Finding the Fourth Proportional to 397.30, 551.95 and 393.74

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Solution

The fourth proportional to 397.30, 551.95 and 393.74 is: 547.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.30 : 551.95 = 393.74 : x
  2. Step 2: Convert to fraction form
    397.30/551.95 = 393.74/x
  3. Step 3: Cross multiply
    397.30x = 551.95 × 393.74
  4. Step 4: Simplify right side
    397.30x = 217,324.79
  5. Step 5: Solve for x
    x = 217,324.79/397.30
  6. Step 6: Final answer
    x = 547.00

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.