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Finding the Fourth Proportional to 94.56, 130.59 and 81.42

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Solution

The fourth proportional to 94.56, 130.59 and 81.42 is: 112.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.56 : 130.59 = 81.42 : x
  2. Step 2: Convert to fraction form
    94.56/130.59 = 81.42/x
  3. Step 3: Cross multiply
    94.56x = 130.59 × 81.42
  4. Step 4: Simplify right side
    94.56x = 10,632.64
  5. Step 5: Solve for x
    x = 10,632.64/94.56
  6. Step 6: Final answer
    x = 112.44

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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.