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Finding the Fourth Proportional to 304.58, 456.87 and 128.85

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Solution

The fourth proportional to 304.58, 456.87 and 128.85 is: 193.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.58 : 456.87 = 128.85 : x
  2. Step 2: Convert to fraction form
    304.58/456.87 = 128.85/x
  3. Step 3: Cross multiply
    304.58x = 456.87 × 128.85
  4. Step 4: Simplify right side
    304.58x = 58,867.70
  5. Step 5: Solve for x
    x = 58,867.70/304.58
  6. Step 6: Final answer
    x = 193.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.