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Finding the Fourth Proportional to 154.20, 230.75 and 145.43

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Solution

The fourth proportional to 154.20, 230.75 and 145.43 is: 217.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.20 : 230.75 = 145.43 : x
  2. Step 2: Convert to fraction form
    154.20/230.75 = 145.43/x
  3. Step 3: Cross multiply
    154.20x = 230.75 × 145.43
  4. Step 4: Simplify right side
    154.20x = 33,557.47
  5. Step 5: Solve for x
    x = 33,557.47/154.20
  6. Step 6: Final answer
    x = 217.63

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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.