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Finding the Fourth Proportional to 110.78, 153.04 and 79.82

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Solution

The fourth proportional to 110.78, 153.04 and 79.82 is: 110.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.78 : 153.04 = 79.82 : x
  2. Step 2: Convert to fraction form
    110.78/153.04 = 79.82/x
  3. Step 3: Cross multiply
    110.78x = 153.04 × 79.82
  4. Step 4: Simplify right side
    110.78x = 12,215.65
  5. Step 5: Solve for x
    x = 12,215.65/110.78
  6. Step 6: Final answer
    x = 110.27

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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.