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Finding the Fourth Proportional to 89.42, 134.13 and 28.56

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Solution

The fourth proportional to 89.42, 134.13 and 28.56 is: 42.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.42 : 134.13 = 28.56 : x
  2. Step 2: Convert to fraction form
    89.42/134.13 = 28.56/x
  3. Step 3: Cross multiply
    89.42x = 134.13 × 28.56
  4. Step 4: Simplify right side
    89.42x = 3,830.75
  5. Step 5: Solve for x
    x = 3,830.75/89.42
  6. Step 6: Final answer
    x = 42.84

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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.