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Finding the Fourth Proportional to 158.45, 218.34 and 121.38

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Solution

The fourth proportional to 158.45, 218.34 and 121.38 is: 167.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.45 : 218.34 = 121.38 : x
  2. Step 2: Convert to fraction form
    158.45/218.34 = 121.38/x
  3. Step 3: Cross multiply
    158.45x = 218.34 × 121.38
  4. Step 4: Simplify right side
    158.45x = 26,502.11
  5. Step 5: Solve for x
    x = 26,502.11/158.45
  6. Step 6: Final answer
    x = 167.26

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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.