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Finding the Fourth Proportional to 154.99, 231.38 and 143.74

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Solution

The fourth proportional to 154.99, 231.38 and 143.74 is: 214.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.99 : 231.38 = 143.74 : x
  2. Step 2: Convert to fraction form
    154.99/231.38 = 143.74/x
  3. Step 3: Cross multiply
    154.99x = 231.38 × 143.74
  4. Step 4: Simplify right side
    154.99x = 33,258.56
  5. Step 5: Solve for x
    x = 33,258.56/154.99
  6. Step 6: Final answer
    x = 214.59

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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.