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Finding the Fourth Proportional to 126.36, 174.54 and 87.72

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Solution

The fourth proportional to 126.36, 174.54 and 87.72 is: 121.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.36 : 174.54 = 87.72 : x
  2. Step 2: Convert to fraction form
    126.36/174.54 = 87.72/x
  3. Step 3: Cross multiply
    126.36x = 174.54 × 87.72
  4. Step 4: Simplify right side
    126.36x = 15,310.65
  5. Step 5: Solve for x
    x = 15,310.65/126.36
  6. Step 6: Final answer
    x = 121.17

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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.