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Finding the Fourth Proportional to 146.45, 201.78 and 99.81

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Solution

The fourth proportional to 146.45, 201.78 and 99.81 is: 137.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.45 : 201.78 = 99.81 : x
  2. Step 2: Convert to fraction form
    146.45/201.78 = 99.81/x
  3. Step 3: Cross multiply
    146.45x = 201.78 × 99.81
  4. Step 4: Simplify right side
    146.45x = 20,139.66
  5. Step 5: Solve for x
    x = 20,139.66/146.45
  6. Step 6: Final answer
    x = 137.52

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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.