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Finding the Fourth Proportional to 768.54, 1,152.60 and 213.11

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Solution

The fourth proportional to 768.54, 1,152.60 and 213.11 is: 319.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.54 : 1,152.60 = 213.11 : x
  2. Step 2: Convert to fraction form
    768.54/1,152.60 = 213.11/x
  3. Step 3: Cross multiply
    768.54x = 1,152.60 × 213.11
  4. Step 4: Simplify right side
    768.54x = 245,633.47
  5. Step 5: Solve for x
    x = 245,633.47/768.54
  6. Step 6: Final answer
    x = 319.61

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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.