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Finding the Fourth Proportional to 94.70, 129.95 and 93.79

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Solution

The fourth proportional to 94.70, 129.95 and 93.79 is: 128.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.70 : 129.95 = 93.79 : x
  2. Step 2: Convert to fraction form
    94.70/129.95 = 93.79/x
  3. Step 3: Cross multiply
    94.70x = 129.95 × 93.79
  4. Step 4: Simplify right side
    94.70x = 12,188.01
  5. Step 5: Solve for x
    x = 12,188.01/94.70
  6. Step 6: Final answer
    x = 128.70

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.