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Finding the Fourth Proportional to 94.34, 140.94 and 85.82

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Solution

The fourth proportional to 94.34, 140.94 and 85.82 is: 128.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.34 : 140.94 = 85.82 : x
  2. Step 2: Convert to fraction form
    94.34/140.94 = 85.82/x
  3. Step 3: Cross multiply
    94.34x = 140.94 × 85.82
  4. Step 4: Simplify right side
    94.34x = 12,095.47
  5. Step 5: Solve for x
    x = 12,095.47/94.34
  6. Step 6: Final answer
    x = 128.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.