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Finding the Fourth Proportional to 304.29, 420.66 and 255.15

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Solution

The fourth proportional to 304.29, 420.66 and 255.15 is: 352.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.29 : 420.66 = 255.15 : x
  2. Step 2: Convert to fraction form
    304.29/420.66 = 255.15/x
  3. Step 3: Cross multiply
    304.29x = 420.66 × 255.15
  4. Step 4: Simplify right side
    304.29x = 107,331.40
  5. Step 5: Solve for x
    x = 107,331.40/304.29
  6. Step 6: Final answer
    x = 352.73

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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.