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Finding the Fourth Proportional to 605.56, 835.38 and 395.64

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Solution

The fourth proportional to 605.56, 835.38 and 395.64 is: 545.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    605.56 : 835.38 = 395.64 : x
  2. Step 2: Convert to fraction form
    605.56/835.38 = 395.64/x
  3. Step 3: Cross multiply
    605.56x = 835.38 × 395.64
  4. Step 4: Simplify right side
    605.56x = 330,509.74
  5. Step 5: Solve for x
    x = 330,509.74/605.56
  6. Step 6: Final answer
    x = 545.79

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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.