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Finding the Fourth Proportional to 146.12, 201.65 and 90.81

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Solution

The fourth proportional to 146.12, 201.65 and 90.81 is: 125.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.12 : 201.65 = 90.81 : x
  2. Step 2: Convert to fraction form
    146.12/201.65 = 90.81/x
  3. Step 3: Cross multiply
    146.12x = 201.65 × 90.81
  4. Step 4: Simplify right side
    146.12x = 18,311.38
  5. Step 5: Solve for x
    x = 18,311.38/146.12
  6. Step 6: Final answer
    x = 125.32

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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.