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Finding the Fourth Proportional to 233.24, 321.85 and 128.31

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Solution

The fourth proportional to 233.24, 321.85 and 128.31 is: 177.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    233.24 : 321.85 = 128.31 : x
  2. Step 2: Convert to fraction form
    233.24/321.85 = 128.31/x
  3. Step 3: Cross multiply
    233.24x = 321.85 × 128.31
  4. Step 4: Simplify right side
    233.24x = 41,294.96
  5. Step 5: Solve for x
    x = 41,294.96/233.24
  6. Step 6: Final answer
    x = 177.05

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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.