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Finding the Fourth Proportional to 111.43, 153.75 and 107.53

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Solution

The fourth proportional to 111.43, 153.75 and 107.53 is: 148.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.43 : 153.75 = 107.53 : x
  2. Step 2: Convert to fraction form
    111.43/153.75 = 107.53/x
  3. Step 3: Cross multiply
    111.43x = 153.75 × 107.53
  4. Step 4: Simplify right side
    111.43x = 16,532.15
  5. Step 5: Solve for x
    x = 16,532.15/111.43
  6. Step 6: Final answer
    x = 148.37

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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.