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Finding the Fourth Proportional to 113.36, 155.94 and 98.78

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Solution

The fourth proportional to 113.36, 155.94 and 98.78 is: 135.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.36 : 155.94 = 98.78 : x
  2. Step 2: Convert to fraction form
    113.36/155.94 = 98.78/x
  3. Step 3: Cross multiply
    113.36x = 155.94 × 98.78
  4. Step 4: Simplify right side
    113.36x = 15,403.75
  5. Step 5: Solve for x
    x = 15,403.75/113.36
  6. Step 6: Final answer
    x = 135.88

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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.