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Finding the Fourth Proportional to 680.09, 1,020.52 and 290.05

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Solution

The fourth proportional to 680.09, 1,020.52 and 290.05 is: 435.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.09 : 1,020.52 = 290.05 : x
  2. Step 2: Convert to fraction form
    680.09/1,020.52 = 290.05/x
  3. Step 3: Cross multiply
    680.09x = 1,020.52 × 290.05
  4. Step 4: Simplify right side
    680.09x = 295,995.27
  5. Step 5: Solve for x
    x = 295,995.27/680.09
  6. Step 6: Final answer
    x = 435.23

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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.