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Finding the Fourth Proportional to 126, 174 and 121.44

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Solution

The fourth proportional to 126, 174 and 121.44 is: 167.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    126 : 174 = 121.44 : x
  2. Step 2: Convert to fraction form
    126/174 = 121.44/x
  3. Step 3: Cross multiply
    126x = 174 × 121.44
  4. Step 4: Simplify right side
    126x = 21,130.56
  5. Step 5: Solve for x
    x = 21,130.56/126
  6. Step 6: Final answer
    x = 167.70

Related Problems

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Double scale
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1.5x scale

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.