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Finding the Fourth Proportional to 146.70, 202.31 and 91.40

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Solution

The fourth proportional to 146.70, 202.31 and 91.40 is: 126.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.70 : 202.31 = 91.40 : x
  2. Step 2: Convert to fraction form
    146.70/202.31 = 91.40/x
  3. Step 3: Cross multiply
    146.70x = 202.31 × 91.40
  4. Step 4: Simplify right side
    146.70x = 18,489.67
  5. Step 5: Solve for x
    x = 18,489.67/146.70
  6. Step 6: Final answer
    x = 126.04

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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.