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Finding the Fourth Proportional to 154.12, 212.10 and 143.56

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Solution

The fourth proportional to 154.12, 212.10 and 143.56 is: 197.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.12 : 212.10 = 143.56 : x
  2. Step 2: Convert to fraction form
    154.12/212.10 = 143.56/x
  3. Step 3: Cross multiply
    154.12x = 212.10 × 143.56
  4. Step 4: Simplify right side
    154.12x = 30,449.08
  5. Step 5: Solve for x
    x = 30,449.08/154.12
  6. Step 6: Final answer
    x = 197.57

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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.