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Finding the Fourth Proportional to 94.58, 142.60 and 85.94

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Solution

The fourth proportional to 94.58, 142.60 and 85.94 is: 129.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.58 : 142.60 = 85.94 : x
  2. Step 2: Convert to fraction form
    94.58/142.60 = 85.94/x
  3. Step 3: Cross multiply
    94.58x = 142.60 × 85.94
  4. Step 4: Simplify right side
    94.58x = 12,254.61
  5. Step 5: Solve for x
    x = 12,254.61/94.58
  6. Step 6: Final answer
    x = 129.57

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.