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Finding the Fourth Proportional to 164.82, 246.96 and 128.74

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Solution

The fourth proportional to 164.82, 246.96 and 128.74 is: 192.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    164.82 : 246.96 = 128.74 : x
  2. Step 2: Convert to fraction form
    164.82/246.96 = 128.74/x
  3. Step 3: Cross multiply
    164.82x = 246.96 × 128.74
  4. Step 4: Simplify right side
    164.82x = 31,793.63
  5. Step 5: Solve for x
    x = 31,793.63/164.82
  6. Step 6: Final answer
    x = 192.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.