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Finding the Fourth Proportional to 155.49, 213.14 and 155.22

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Solution

The fourth proportional to 155.49, 213.14 and 155.22 is: 212.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.49 : 213.14 = 155.22 : x
  2. Step 2: Convert to fraction form
    155.49/213.14 = 155.22/x
  3. Step 3: Cross multiply
    155.49x = 213.14 × 155.22
  4. Step 4: Simplify right side
    155.49x = 33,082.81
  5. Step 5: Solve for x
    x = 33,082.81/155.49
  6. Step 6: Final answer
    x = 212.76

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.