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Finding the Fourth Proportional to 154.22, 213.90 and 148.72

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Solution

The fourth proportional to 154.22, 213.90 and 148.72 is: 206.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.22 : 213.90 = 148.72 : x
  2. Step 2: Convert to fraction form
    154.22/213.90 = 148.72/x
  3. Step 3: Cross multiply
    154.22x = 213.90 × 148.72
  4. Step 4: Simplify right side
    154.22x = 31,811.21
  5. Step 5: Solve for x
    x = 31,811.21/154.22
  6. Step 6: Final answer
    x = 206.27

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.