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Finding the Fourth Proportional to 154.70, 231.42 and 143.18

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Solution

The fourth proportional to 154.70, 231.42 and 143.18 is: 214.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.70 : 231.42 = 143.18 : x
  2. Step 2: Convert to fraction form
    154.70/231.42 = 143.18/x
  3. Step 3: Cross multiply
    154.70x = 231.42 × 143.18
  4. Step 4: Simplify right side
    154.70x = 33,134.72
  5. Step 5: Solve for x
    x = 33,134.72/154.70
  6. Step 6: Final answer
    x = 214.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.