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Finding the Fourth Proportional to 94.79, 142.16 and 85.61

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Solution

The fourth proportional to 94.79, 142.16 and 85.61 is: 128.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.79 : 142.16 = 85.61 : x
  2. Step 2: Convert to fraction form
    94.79/142.16 = 85.61/x
  3. Step 3: Cross multiply
    94.79x = 142.16 × 85.61
  4. Step 4: Simplify right side
    94.79x = 12,169.18
  5. Step 5: Solve for x
    x = 12,169.18/94.79
  6. Step 6: Final answer
    x = 128.39

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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.