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Finding the Fourth Proportional to 158.21, 218.27 and 138.53

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Solution

The fourth proportional to 158.21, 218.27 and 138.53 is: 191.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.21 : 218.27 = 138.53 : x
  2. Step 2: Convert to fraction form
    158.21/218.27 = 138.53/x
  3. Step 3: Cross multiply
    158.21x = 218.27 × 138.53
  4. Step 4: Simplify right side
    158.21x = 30,235.98
  5. Step 5: Solve for x
    x = 30,235.98/158.21
  6. Step 6: Final answer
    x = 191.12

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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.