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Finding the Fourth Proportional to 164.28, 226.71 and 98.78

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Solution

The fourth proportional to 164.28, 226.71 and 98.78 is: 136.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    164.28 : 226.71 = 98.78 : x
  2. Step 2: Convert to fraction form
    164.28/226.71 = 98.78/x
  3. Step 3: Cross multiply
    164.28x = 226.71 × 98.78
  4. Step 4: Simplify right side
    164.28x = 22,394.41
  5. Step 5: Solve for x
    x = 22,394.41/164.28
  6. Step 6: Final answer
    x = 136.32

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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.