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Finding the Fourth Proportional to 233.08, 321.64 and 128.17

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Solution

The fourth proportional to 233.08, 321.64 and 128.17 is: 176.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    233.08 : 321.64 = 128.17 : x
  2. Step 2: Convert to fraction form
    233.08/321.64 = 128.17/x
  3. Step 3: Cross multiply
    233.08x = 321.64 × 128.17
  4. Step 4: Simplify right side
    233.08x = 41,223.47
  5. Step 5: Solve for x
    x = 41,223.47/233.08
  6. Step 6: Final answer
    x = 176.87

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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.