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Finding the Fourth Proportional to 111.17, 153.43 and 78.44

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Solution

The fourth proportional to 111.17, 153.43 and 78.44 is: 108.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.17 : 153.43 = 78.44 : x
  2. Step 2: Convert to fraction form
    111.17/153.43 = 78.44/x
  3. Step 3: Cross multiply
    111.17x = 153.43 × 78.44
  4. Step 4: Simplify right side
    111.17x = 12,034.09
  5. Step 5: Solve for x
    x = 12,034.09/111.17
  6. Step 6: Final answer
    x = 108.25

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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.