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Finding the Fourth Proportional to 233.79, 322.62 and 128.87

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Solution

The fourth proportional to 233.79, 322.62 and 128.87 is: 177.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    233.79 : 322.62 = 128.87 : x
  2. Step 2: Convert to fraction form
    233.79/322.62 = 128.87/x
  3. Step 3: Cross multiply
    233.79x = 322.62 × 128.87
  4. Step 4: Simplify right side
    233.79x = 41,576.52
  5. Step 5: Solve for x
    x = 41,576.52/233.79
  6. Step 6: Final answer
    x = 177.84

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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.