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Finding the Fourth Proportional to 93.78, 141.18 and 69.92

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Solution

The fourth proportional to 93.78, 141.18 and 69.92 is: 105.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.78 : 141.18 = 69.92 : x
  2. Step 2: Convert to fraction form
    93.78/141.18 = 69.92/x
  3. Step 3: Cross multiply
    93.78x = 141.18 × 69.92
  4. Step 4: Simplify right side
    93.78x = 9,871.31
  5. Step 5: Solve for x
    x = 9,871.31/93.78
  6. Step 6: Final answer
    x = 105.26

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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.