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Finding the Fourth Proportional to 94.70, 130.61 and 81.74

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Solution

The fourth proportional to 94.70, 130.61 and 81.74 is: 112.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.70 : 130.61 = 81.74 : x
  2. Step 2: Convert to fraction form
    94.70/130.61 = 81.74/x
  3. Step 3: Cross multiply
    94.70x = 130.61 × 81.74
  4. Step 4: Simplify right side
    94.70x = 10,676.59
  5. Step 5: Solve for x
    x = 10,676.59/94.70
  6. Step 6: Final answer
    x = 112.74

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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.