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Finding the Fourth Proportional to 798.21, 1,197.21 and 311.60

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Solution

The fourth proportional to 798.21, 1,197.21 and 311.60 is: 467.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.21 : 1,197.21 = 311.60 : x
  2. Step 2: Convert to fraction form
    798.21/1,197.21 = 311.60/x
  3. Step 3: Cross multiply
    798.21x = 1,197.21 × 311.60
  4. Step 4: Simplify right side
    798.21x = 373,054.80
  5. Step 5: Solve for x
    x = 373,054.80/798.21
  6. Step 6: Final answer
    x = 467.36

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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.