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Finding the Fourth Proportional to 233.26, 321.90 and 128.35

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Solution

The fourth proportional to 233.26, 321.90 and 128.35 is: 177.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    233.26 : 321.90 = 128.35 : x
  2. Step 2: Convert to fraction form
    233.26/321.90 = 128.35/x
  3. Step 3: Cross multiply
    233.26x = 321.90 × 128.35
  4. Step 4: Simplify right side
    233.26x = 41,313.61
  5. Step 5: Solve for x
    x = 41,313.61/233.26
  6. Step 6: Final answer
    x = 177.12

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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.