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Finding the Fourth Proportional to 93.79, 140.08 and 78.58

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Solution

The fourth proportional to 93.79, 140.08 and 78.58 is: 117.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.79 : 140.08 = 78.58 : x
  2. Step 2: Convert to fraction form
    93.79/140.08 = 78.58/x
  3. Step 3: Cross multiply
    93.79x = 140.08 × 78.58
  4. Step 4: Simplify right side
    93.79x = 11,007.49
  5. Step 5: Solve for x
    x = 11,007.49/93.79
  6. Step 6: Final answer
    x = 117.36

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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.