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Finding the Fourth Proportional to 154.90, 232.39 and 52.21

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Solution

The fourth proportional to 154.90, 232.39 and 52.21 is: 78.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.90 : 232.39 = 52.21 : x
  2. Step 2: Convert to fraction form
    154.90/232.39 = 52.21/x
  3. Step 3: Cross multiply
    154.90x = 232.39 × 52.21
  4. Step 4: Simplify right side
    154.90x = 12,133.44
  5. Step 5: Solve for x
    x = 12,133.44/154.90
  6. Step 6: Final answer
    x = 78.33

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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.