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Finding the Fourth Proportional to 305.23, 420.56 and 255.26

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Solution

The fourth proportional to 305.23, 420.56 and 255.26 is: 351.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.23 : 420.56 = 255.26 : x
  2. Step 2: Convert to fraction form
    305.23/420.56 = 255.26/x
  3. Step 3: Cross multiply
    305.23x = 420.56 × 255.26
  4. Step 4: Simplify right side
    305.23x = 107,350.87
  5. Step 5: Solve for x
    x = 107,350.87/305.23
  6. Step 6: Final answer
    x = 351.71

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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.