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Finding the Fourth Proportional to 89.37, 134.19 and 85.53

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Solution

The fourth proportional to 89.37, 134.19 and 85.53 is: 128.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.37 : 134.19 = 85.53 : x
  2. Step 2: Convert to fraction form
    89.37/134.19 = 85.53/x
  3. Step 3: Cross multiply
    89.37x = 134.19 × 85.53
  4. Step 4: Simplify right side
    89.37x = 11,477.27
  5. Step 5: Solve for x
    x = 11,477.27/89.37
  6. Step 6: Final answer
    x = 128.42

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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.