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Finding the Fourth Proportional to 798.40, 1,197.62 and 311.56

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Solution

The fourth proportional to 798.40, 1,197.62 and 311.56 is: 467.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.40 : 1,197.62 = 311.56 : x
  2. Step 2: Convert to fraction form
    798.40/1,197.62 = 311.56/x
  3. Step 3: Cross multiply
    798.40x = 1,197.62 × 311.56
  4. Step 4: Simplify right side
    798.40x = 373,130.49
  5. Step 5: Solve for x
    x = 373,130.49/798.40
  6. Step 6: Final answer
    x = 467.35

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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.