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Finding the Fourth Proportional to 405.11, 603.13 and 399.34

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Solution

The fourth proportional to 405.11, 603.13 and 399.34 is: 594.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.11 : 603.13 = 399.34 : x
  2. Step 2: Convert to fraction form
    405.11/603.13 = 399.34/x
  3. Step 3: Cross multiply
    405.11x = 603.13 × 399.34
  4. Step 4: Simplify right side
    405.11x = 240,851.43
  5. Step 5: Solve for x
    x = 240,851.43/405.11
  6. Step 6: Final answer
    x = 594.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.