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Finding the Fourth Proportional to 183.92, 253.37 and 128.55

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Solution

The fourth proportional to 183.92, 253.37 and 128.55 is: 177.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    183.92 : 253.37 = 128.55 : x
  2. Step 2: Convert to fraction form
    183.92/253.37 = 128.55/x
  3. Step 3: Cross multiply
    183.92x = 253.37 × 128.55
  4. Step 4: Simplify right side
    183.92x = 32,570.07
  5. Step 5: Solve for x
    x = 32,570.07/183.92
  6. Step 6: Final answer
    x = 177.09

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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.