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Finding the Fourth Proportional to 126.44, 174.38 and 87.16

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Solution

The fourth proportional to 126.44, 174.38 and 87.16 is: 120.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.44 : 174.38 = 87.16 : x
  2. Step 2: Convert to fraction form
    126.44/174.38 = 87.16/x
  3. Step 3: Cross multiply
    126.44x = 174.38 × 87.16
  4. Step 4: Simplify right side
    126.44x = 15,199.07
  5. Step 5: Solve for x
    x = 15,199.07/126.44
  6. Step 6: Final answer
    x = 120.21

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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.