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Finding the Fourth Proportional to 403.24, 605.66 and 391.90

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Solution

The fourth proportional to 403.24, 605.66 and 391.90 is: 588.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.24 : 605.66 = 391.90 : x
  2. Step 2: Convert to fraction form
    403.24/605.66 = 391.90/x
  3. Step 3: Cross multiply
    403.24x = 605.66 × 391.90
  4. Step 4: Simplify right side
    403.24x = 237,355.13
  5. Step 5: Solve for x
    x = 237,355.13/403.24
  6. Step 6: Final answer
    x = 588.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.