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Finding the Fourth Proportional to 399.27, 553.56 and 377.40

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Solution

The fourth proportional to 399.27, 553.56 and 377.40 is: 523.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.27 : 553.56 = 377.40 : x
  2. Step 2: Convert to fraction form
    399.27/553.56 = 377.40/x
  3. Step 3: Cross multiply
    399.27x = 553.56 × 377.40
  4. Step 4: Simplify right side
    399.27x = 208,913.54
  5. Step 5: Solve for x
    x = 208,913.54/399.27
  6. Step 6: Final answer
    x = 523.24

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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.