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Finding the Fourth Proportional to 452.78, 679.28 and 128.14

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Solution

The fourth proportional to 452.78, 679.28 and 128.14 is: 192.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.78 : 679.28 = 128.14 : x
  2. Step 2: Convert to fraction form
    452.78/679.28 = 128.14/x
  3. Step 3: Cross multiply
    452.78x = 679.28 × 128.14
  4. Step 4: Simplify right side
    452.78x = 87,046.01
  5. Step 5: Solve for x
    x = 87,046.01/452.78
  6. Step 6: Final answer
    x = 192.25

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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.