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Finding the Fourth Proportional to 133.78, 184.64 and 84.70

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Solution

The fourth proportional to 133.78, 184.64 and 84.70 is: 116.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.78 : 184.64 = 84.70 : x
  2. Step 2: Convert to fraction form
    133.78/184.64 = 84.70/x
  3. Step 3: Cross multiply
    133.78x = 184.64 × 84.70
  4. Step 4: Simplify right side
    133.78x = 15,639.01
  5. Step 5: Solve for x
    x = 15,639.01/133.78
  6. Step 6: Final answer
    x = 116.90

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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.