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Finding the Fourth Proportional to 93.74, 140.01 and 78.39

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Solution

The fourth proportional to 93.74, 140.01 and 78.39 is: 117.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.74 : 140.01 = 78.39 : x
  2. Step 2: Convert to fraction form
    93.74/140.01 = 78.39/x
  3. Step 3: Cross multiply
    93.74x = 140.01 × 78.39
  4. Step 4: Simplify right side
    93.74x = 10,975.38
  5. Step 5: Solve for x
    x = 10,975.38/93.74
  6. Step 6: Final answer
    x = 117.09

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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.