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Finding the Fourth Proportional to 401.18, 557.46 and 399.56

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Solution

The fourth proportional to 401.18, 557.46 and 399.56 is: 555.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.18 : 557.46 = 399.56 : x
  2. Step 2: Convert to fraction form
    401.18/557.46 = 399.56/x
  3. Step 3: Cross multiply
    401.18x = 557.46 × 399.56
  4. Step 4: Simplify right side
    401.18x = 222,735.93
  5. Step 5: Solve for x
    x = 222,735.93/401.18
  6. Step 6: Final answer
    x = 555.21

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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.