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Finding the Fourth Proportional to 223.53, 308.41 and 128.99

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Solution

The fourth proportional to 223.53, 308.41 and 128.99 is: 177.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.53 : 308.41 = 128.99 : x
  2. Step 2: Convert to fraction form
    223.53/308.41 = 128.99/x
  3. Step 3: Cross multiply
    223.53x = 308.41 × 128.99
  4. Step 4: Simplify right side
    223.53x = 39,779.94
  5. Step 5: Solve for x
    x = 39,779.94/223.53
  6. Step 6: Final answer
    x = 177.96

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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.