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Finding the Fourth Proportional to 223.43, 308.09 and 153.53

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Solution

The fourth proportional to 223.43, 308.09 and 153.53 is: 211.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.43 : 308.09 = 153.53 : x
  2. Step 2: Convert to fraction form
    223.43/308.09 = 153.53/x
  3. Step 3: Cross multiply
    223.43x = 308.09 × 153.53
  4. Step 4: Simplify right side
    223.43x = 47,298.75
  5. Step 5: Solve for x
    x = 47,298.75/223.43
  6. Step 6: Final answer
    x = 211.70

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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.