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Finding the Fourth Proportional to 154.51, 213.27 and 107.86

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Solution

The fourth proportional to 154.51, 213.27 and 107.86 is: 148.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.51 : 213.27 = 107.86 : x
  2. Step 2: Convert to fraction form
    154.51/213.27 = 107.86/x
  3. Step 3: Cross multiply
    154.51x = 213.27 × 107.86
  4. Step 4: Simplify right side
    154.51x = 23,003.30
  5. Step 5: Solve for x
    x = 23,003.30/154.51
  6. Step 6: Final answer
    x = 148.88

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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.