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Finding the Fourth Proportional to 94.10, 140.36 and 78.71

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Solution

The fourth proportional to 94.10, 140.36 and 78.71 is: 117.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.10 : 140.36 = 78.71 : x
  2. Step 2: Convert to fraction form
    94.10/140.36 = 78.71/x
  3. Step 3: Cross multiply
    94.10x = 140.36 × 78.71
  4. Step 4: Simplify right side
    94.10x = 11,046.64
  5. Step 5: Solve for x
    x = 11,046.64/94.10
  6. Step 6: Final answer
    x = 117.40

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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.