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Finding the Fourth Proportional to 94.15, 141.02 and 89.90

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Solution

The fourth proportional to 94.15, 141.02 and 89.90 is: 134.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.15 : 141.02 = 89.90 : x
  2. Step 2: Convert to fraction form
    94.15/141.02 = 89.90/x
  3. Step 3: Cross multiply
    94.15x = 141.02 × 89.90
  4. Step 4: Simplify right side
    94.15x = 12,677.70
  5. Step 5: Solve for x
    x = 12,677.70/94.15
  6. Step 6: Final answer
    x = 134.65

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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.