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Finding the Fourth Proportional to 164.50, 246.85 and 91.38

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Solution

The fourth proportional to 164.50, 246.85 and 91.38 is: 137.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    164.50 : 246.85 = 91.38 : x
  2. Step 2: Convert to fraction form
    164.50/246.85 = 91.38/x
  3. Step 3: Cross multiply
    164.50x = 246.85 × 91.38
  4. Step 4: Simplify right side
    164.50x = 22,557.15
  5. Step 5: Solve for x
    x = 22,557.15/164.50
  6. Step 6: Final answer
    x = 137.13

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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.