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Finding the Fourth Proportional to 605.20, 835.40 and 408.72

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Solution

The fourth proportional to 605.20, 835.40 and 408.72 is: 564.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    605.20 : 835.40 = 408.72 : x
  2. Step 2: Convert to fraction form
    605.20/835.40 = 408.72/x
  3. Step 3: Cross multiply
    605.20x = 835.40 × 408.72
  4. Step 4: Simplify right side
    605.20x = 341,444.69
  5. Step 5: Solve for x
    x = 341,444.69/605.20
  6. Step 6: Final answer
    x = 564.18

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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.