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Finding the Fourth Proportional to 113.78, 157.07 and 103.94

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Solution

The fourth proportional to 113.78, 157.07 and 103.94 is: 143.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.78 : 157.07 = 103.94 : x
  2. Step 2: Convert to fraction form
    113.78/157.07 = 103.94/x
  3. Step 3: Cross multiply
    113.78x = 157.07 × 103.94
  4. Step 4: Simplify right side
    113.78x = 16,324.55
  5. Step 5: Solve for x
    x = 16,324.55/113.78
  6. Step 6: Final answer
    x = 143.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.