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Finding the Fourth Proportional to 223.47, 308.31 and 149.81

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Solution

The fourth proportional to 223.47, 308.31 and 149.81 is: 206.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.47 : 308.31 = 149.81 : x
  2. Step 2: Convert to fraction form
    223.47/308.31 = 149.81/x
  3. Step 3: Cross multiply
    223.47x = 308.31 × 149.81
  4. Step 4: Simplify right side
    223.47x = 46,186.38
  5. Step 5: Solve for x
    x = 46,186.38/223.47
  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.