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Finding the Fourth Proportional to 131.96, 183.30 and 128.12

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Solution

The fourth proportional to 131.96, 183.30 and 128.12 is: 177.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.96 : 183.30 = 128.12 : x
  2. Step 2: Convert to fraction form
    131.96/183.30 = 128.12/x
  3. Step 3: Cross multiply
    131.96x = 183.30 × 128.12
  4. Step 4: Simplify right side
    131.96x = 23,483.00
  5. Step 5: Solve for x
    x = 23,483.00/131.96
  6. Step 6: Final answer
    x = 177.95

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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.