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Finding the Fourth Proportional to 969.10, 1,450.79 and 639.43

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Solution

The fourth proportional to 969.10, 1,450.79 and 639.43 is: 957.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.10 : 1,450.79 = 639.43 : x
  2. Step 2: Convert to fraction form
    969.10/1,450.79 = 639.43/x
  3. Step 3: Cross multiply
    969.10x = 1,450.79 × 639.43
  4. Step 4: Simplify right side
    969.10x = 927,678.65
  5. Step 5: Solve for x
    x = 927,678.65/969.10
  6. Step 6: Final answer
    x = 957.26

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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.