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Finding the Fourth Proportional to 113.16, 168.54 and 111

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Solution

The fourth proportional to 113.16, 168.54 and 111 is: 165.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.16 : 168.54 = 111 : x
  2. Step 2: Convert to fraction form
    113.16/168.54 = 111/x
  3. Step 3: Cross multiply
    113.16x = 168.54 × 111
  4. Step 4: Simplify right side
    113.16x = 18,707.94
  5. Step 5: Solve for x
    x = 18,707.94/113.16
  6. Step 6: Final answer
    x = 165.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.