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Finding the Fourth Proportional to 94.74, 142.90 and 89.12

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Solution

The fourth proportional to 94.74, 142.90 and 89.12 is: 134.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.74 : 142.90 = 89.12 : x
  2. Step 2: Convert to fraction form
    94.74/142.90 = 89.12/x
  3. Step 3: Cross multiply
    94.74x = 142.90 × 89.12
  4. Step 4: Simplify right side
    94.74x = 12,734.58
  5. Step 5: Solve for x
    x = 12,734.58/94.74
  6. Step 6: Final answer
    x = 134.42

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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.