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Finding the Fourth Proportional to 223.48, 308.38 and 149.78

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Solution

The fourth proportional to 223.48, 308.38 and 149.78 is: 206.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.48 : 308.38 = 149.78 : x
  2. Step 2: Convert to fraction form
    223.48/308.38 = 149.78/x
  3. Step 3: Cross multiply
    223.48x = 308.38 × 149.78
  4. Step 4: Simplify right side
    223.48x = 46,189.16
  5. Step 5: Solve for x
    x = 46,189.16/223.48
  6. Step 6: Final answer
    x = 206.68

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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.