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Finding the Fourth Proportional to 304.86, 421.70 and 255.59

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Solution

The fourth proportional to 304.86, 421.70 and 255.59 is: 353.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.86 : 421.70 = 255.59 : x
  2. Step 2: Convert to fraction form
    304.86/421.70 = 255.59/x
  3. Step 3: Cross multiply
    304.86x = 421.70 × 255.59
  4. Step 4: Simplify right side
    304.86x = 107,778.92
  5. Step 5: Solve for x
    x = 107,778.92/304.86
  6. Step 6: Final answer
    x = 353.54

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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.