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Finding the Fourth Proportional to 147.21, 203.12 and 126.65

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Solution

The fourth proportional to 147.21, 203.12 and 126.65 is: 174.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.21 : 203.12 = 126.65 : x
  2. Step 2: Convert to fraction form
    147.21/203.12 = 126.65/x
  3. Step 3: Cross multiply
    147.21x = 203.12 × 126.65
  4. Step 4: Simplify right side
    147.21x = 25,725.15
  5. Step 5: Solve for x
    x = 25,725.15/147.21
  6. Step 6: Final answer
    x = 174.75

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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.