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Finding the Fourth Proportional to 154.44, 212.76 and 143.91

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Solution

The fourth proportional to 154.44, 212.76 and 143.91 is: 198.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.44 : 212.76 = 143.91 : x
  2. Step 2: Convert to fraction form
    154.44/212.76 = 143.91/x
  3. Step 3: Cross multiply
    154.44x = 212.76 × 143.91
  4. Step 4: Simplify right side
    154.44x = 30,618.29
  5. Step 5: Solve for x
    x = 30,618.29/154.44
  6. Step 6: Final answer
    x = 198.25

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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.