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Finding the Fourth Proportional to 401.10, 552.85 and 393.81

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Solution

The fourth proportional to 401.10, 552.85 and 393.81 is: 542.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.10 : 552.85 = 393.81 : x
  2. Step 2: Convert to fraction form
    401.10/552.85 = 393.81/x
  3. Step 3: Cross multiply
    401.10x = 552.85 × 393.81
  4. Step 4: Simplify right side
    401.10x = 217,717.86
  5. Step 5: Solve for x
    x = 217,717.86/401.10
  6. Step 6: Final answer
    x = 542.80

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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.