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Finding the Fourth Proportional to 798.34, 1,196.36 and 643.42

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Solution

The fourth proportional to 798.34, 1,196.36 and 643.42 is: 964.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.34 : 1,196.36 = 643.42 : x
  2. Step 2: Convert to fraction form
    798.34/1,196.36 = 643.42/x
  3. Step 3: Cross multiply
    798.34x = 1,196.36 × 643.42
  4. Step 4: Simplify right side
    798.34x = 769,761.95
  5. Step 5: Solve for x
    x = 769,761.95/798.34
  6. Step 6: Final answer
    x = 964.20

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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.