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Finding the Fourth Proportional to 158.24, 218.21 and 123.21

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Solution

The fourth proportional to 158.24, 218.21 and 123.21 is: 169.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.24 : 218.21 = 123.21 : x
  2. Step 2: Convert to fraction form
    158.24/218.21 = 123.21/x
  3. Step 3: Cross multiply
    158.24x = 218.21 × 123.21
  4. Step 4: Simplify right side
    158.24x = 26,885.65
  5. Step 5: Solve for x
    x = 26,885.65/158.24
  6. Step 6: Final answer
    x = 169.90

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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.