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Finding the Fourth Proportional to 133.19, 183.74 and 81.47

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Solution

The fourth proportional to 133.19, 183.74 and 81.47 is: 112.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.19 : 183.74 = 81.47 : x
  2. Step 2: Convert to fraction form
    133.19/183.74 = 81.47/x
  3. Step 3: Cross multiply
    133.19x = 183.74 × 81.47
  4. Step 4: Simplify right side
    133.19x = 14,968.58
  5. Step 5: Solve for x
    x = 14,968.58/133.19
  6. Step 6: Final answer
    x = 112.39

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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.