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Finding the Fourth Proportional to 93.96, 140.18 and 89.40

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Solution

The fourth proportional to 93.96, 140.18 and 89.40 is: 133.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.96 : 140.18 = 89.40 : x
  2. Step 2: Convert to fraction form
    93.96/140.18 = 89.40/x
  3. Step 3: Cross multiply
    93.96x = 140.18 × 89.40
  4. Step 4: Simplify right side
    93.96x = 12,531.65
  5. Step 5: Solve for x
    x = 12,531.65/93.96
  6. Step 6: Final answer
    x = 133.37

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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.