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Finding the Fourth Proportional to 131.63, 182.39 and 128.79

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Solution

The fourth proportional to 131.63, 182.39 and 128.79 is: 178.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.63 : 182.39 = 128.79 : x
  2. Step 2: Convert to fraction form
    131.63/182.39 = 128.79/x
  3. Step 3: Cross multiply
    131.63x = 182.39 × 128.79
  4. Step 4: Simplify right side
    131.63x = 23,489.36
  5. Step 5: Solve for x
    x = 23,489.36/131.63
  6. Step 6: Final answer
    x = 178.46

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.