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Finding the Fourth Proportional to 798.76, 1,198.72 and 388.12

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Solution

The fourth proportional to 798.76, 1,198.72 and 388.12 is: 582.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.76 : 1,198.72 = 388.12 : x
  2. Step 2: Convert to fraction form
    798.76/1,198.72 = 388.12/x
  3. Step 3: Cross multiply
    798.76x = 1,198.72 × 388.12
  4. Step 4: Simplify right side
    798.76x = 465,247.21
  5. Step 5: Solve for x
    x = 465,247.21/798.76
  6. Step 6: Final answer
    x = 582.46

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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.