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Finding the Fourth Proportional to 126.64, 174.78 and 74.21

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Solution

The fourth proportional to 126.64, 174.78 and 74.21 is: 102.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.64 : 174.78 = 74.21 : x
  2. Step 2: Convert to fraction form
    126.64/174.78 = 74.21/x
  3. Step 3: Cross multiply
    126.64x = 174.78 × 74.21
  4. Step 4: Simplify right side
    126.64x = 12,971.26
  5. Step 5: Solve for x
    x = 12,971.26/126.64
  6. Step 6: Final answer
    x = 102.42

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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.