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Finding the Fourth Proportional to 304.56, 420.88 and 255.32

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Solution

The fourth proportional to 304.56, 420.88 and 255.32 is: 352.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.56 : 420.88 = 255.32 : x
  2. Step 2: Convert to fraction form
    304.56/420.88 = 255.32/x
  3. Step 3: Cross multiply
    304.56x = 420.88 × 255.32
  4. Step 4: Simplify right side
    304.56x = 107,459.08
  5. Step 5: Solve for x
    x = 107,459.08/304.56
  6. Step 6: Final answer
    x = 352.83

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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.