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Finding the Fourth Proportional to 89.78, 134.60 and 35.64

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Solution

The fourth proportional to 89.78, 134.60 and 35.64 is: 53.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.78 : 134.60 = 35.64 : x
  2. Step 2: Convert to fraction form
    89.78/134.60 = 35.64/x
  3. Step 3: Cross multiply
    89.78x = 134.60 × 35.64
  4. Step 4: Simplify right side
    89.78x = 4,796.97
  5. Step 5: Solve for x
    x = 4,796.97/89.78
  6. Step 6: Final answer
    x = 53.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.