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Finding the Fourth Proportional to 825.44, 1,238.15 and 642.95

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Solution

The fourth proportional to 825.44, 1,238.15 and 642.95 is: 964.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.44 : 1,238.15 = 642.95 : x
  2. Step 2: Convert to fraction form
    825.44/1,238.15 = 642.95/x
  3. Step 3: Cross multiply
    825.44x = 1,238.15 × 642.95
  4. Step 4: Simplify right side
    825.44x = 796,068.42
  5. Step 5: Solve for x
    x = 796,068.42/825.44
  6. Step 6: Final answer
    x = 964.42

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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.