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Finding the Fourth Proportional to 93.20, 140.45 and 84.38

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Solution

The fourth proportional to 93.20, 140.45 and 84.38 is: 127.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.20 : 140.45 = 84.38 : x
  2. Step 2: Convert to fraction form
    93.20/140.45 = 84.38/x
  3. Step 3: Cross multiply
    93.20x = 140.45 × 84.38
  4. Step 4: Simplify right side
    93.20x = 11,850.05
  5. Step 5: Solve for x
    x = 11,850.05/93.20
  6. Step 6: Final answer
    x = 127.15

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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.