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Finding the Fourth Proportional to 133.16, 183.93 and 128.91

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Solution

The fourth proportional to 133.16, 183.93 and 128.91 is: 178.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.16 : 183.93 = 128.91 : x
  2. Step 2: Convert to fraction form
    133.16/183.93 = 128.91/x
  3. Step 3: Cross multiply
    133.16x = 183.93 × 128.91
  4. Step 4: Simplify right side
    133.16x = 23,710.42
  5. Step 5: Solve for x
    x = 23,710.42/133.16
  6. Step 6: Final answer
    x = 178.06

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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.