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Finding the Fourth Proportional to 111.07, 153.35 and 82

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Solution

The fourth proportional to 111.07, 153.35 and 82 is: 113.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.07 : 153.35 = 82 : x
  2. Step 2: Convert to fraction form
    111.07/153.35 = 82/x
  3. Step 3: Cross multiply
    111.07x = 153.35 × 82
  4. Step 4: Simplify right side
    111.07x = 12,574.70
  5. Step 5: Solve for x
    x = 12,574.70/111.07
  6. Step 6: Final answer
    x = 113.21

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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.