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Finding the Fourth Proportional to 223.72, 308.90 and 153.78

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Solution

The fourth proportional to 223.72, 308.90 and 153.78 is: 212.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.72 : 308.90 = 153.78 : x
  2. Step 2: Convert to fraction form
    223.72/308.90 = 153.78/x
  3. Step 3: Cross multiply
    223.72x = 308.90 × 153.78
  4. Step 4: Simplify right side
    223.72x = 47,502.64
  5. Step 5: Solve for x
    x = 47,502.64/223.72
  6. Step 6: Final answer
    x = 212.33

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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.