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Finding the Fourth Proportional to 233.91, 322.80 and 129

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Solution

The fourth proportional to 233.91, 322.80 and 129 is: 178.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    233.91 : 322.80 = 129 : x
  2. Step 2: Convert to fraction form
    233.91/322.80 = 129/x
  3. Step 3: Cross multiply
    233.91x = 322.80 × 129
  4. Step 4: Simplify right side
    233.91x = 41,641.20
  5. Step 5: Solve for x
    x = 41,641.20/233.91
  6. Step 6: Final answer
    x = 178.02

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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.