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Finding the Fourth Proportional to 452.88, 679.22 and 128.28

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Solution

The fourth proportional to 452.88, 679.22 and 128.28 is: 192.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.88 : 679.22 = 128.28 : x
  2. Step 2: Convert to fraction form
    452.88/679.22 = 128.28/x
  3. Step 3: Cross multiply
    452.88x = 679.22 × 128.28
  4. Step 4: Simplify right side
    452.88x = 87,130.34
  5. Step 5: Solve for x
    x = 87,130.34/452.88
  6. Step 6: Final answer
    x = 192.39

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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.