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Finding the Fourth Proportional to 93.44, 140.31 and 78.34

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Solution

The fourth proportional to 93.44, 140.31 and 78.34 is: 117.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.44 : 140.31 = 78.34 : x
  2. Step 2: Convert to fraction form
    93.44/140.31 = 78.34/x
  3. Step 3: Cross multiply
    93.44x = 140.31 × 78.34
  4. Step 4: Simplify right side
    93.44x = 10,991.89
  5. Step 5: Solve for x
    x = 10,991.89/93.44
  6. Step 6: Final answer
    x = 117.64

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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.