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Finding the Fourth Proportional to 111.31, 153.60 and 76.27

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Solution

The fourth proportional to 111.31, 153.60 and 76.27 is: 105.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.31 : 153.60 = 76.27 : x
  2. Step 2: Convert to fraction form
    111.31/153.60 = 76.27/x
  3. Step 3: Cross multiply
    111.31x = 153.60 × 76.27
  4. Step 4: Simplify right side
    111.31x = 11,715.07
  5. Step 5: Solve for x
    x = 11,715.07/111.31
  6. Step 6: Final answer
    x = 105.25

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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.