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Finding the Fourth Proportional to 825.45, 1,138.59 and 628.62

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Solution

The fourth proportional to 825.45, 1,138.59 and 628.62 is: 867.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.45 : 1,138.59 = 628.62 : x
  2. Step 2: Convert to fraction form
    825.45/1,138.59 = 628.62/x
  3. Step 3: Cross multiply
    825.45x = 1,138.59 × 628.62
  4. Step 4: Simplify right side
    825.45x = 715,740.45
  5. Step 5: Solve for x
    x = 715,740.45/825.45
  6. Step 6: Final answer
    x = 867.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.