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Finding the Fourth Proportional to 452.70, 679.06 and 128.09

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Solution

The fourth proportional to 452.70, 679.06 and 128.09 is: 192.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.70 : 679.06 = 128.09 : x
  2. Step 2: Convert to fraction form
    452.70/679.06 = 128.09/x
  3. Step 3: Cross multiply
    452.70x = 679.06 × 128.09
  4. Step 4: Simplify right side
    452.70x = 86,980.80
  5. Step 5: Solve for x
    x = 86,980.80/452.70
  6. Step 6: Final answer
    x = 192.14

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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.