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Finding the Fourth Proportional to 798.27, 1,195.65 and 643.83

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Solution

The fourth proportional to 798.27, 1,195.65 and 643.83 is: 964.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.27 : 1,195.65 = 643.83 : x
  2. Step 2: Convert to fraction form
    798.27/1,195.65 = 643.83/x
  3. Step 3: Cross multiply
    798.27x = 1,195.65 × 643.83
  4. Step 4: Simplify right side
    798.27x = 769,795.34
  5. Step 5: Solve for x
    x = 769,795.34/798.27
  6. Step 6: Final answer
    x = 964.33

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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.