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Finding the Fourth Proportional to 93.18, 140.49 and 85.68

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Solution

The fourth proportional to 93.18, 140.49 and 85.68 is: 129.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.18 : 140.49 = 85.68 : x
  2. Step 2: Convert to fraction form
    93.18/140.49 = 85.68/x
  3. Step 3: Cross multiply
    93.18x = 140.49 × 85.68
  4. Step 4: Simplify right side
    93.18x = 12,037.18
  5. Step 5: Solve for x
    x = 12,037.18/93.18
  6. Step 6: Final answer
    x = 129.18

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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.