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Finding the Fourth Proportional to 980.21, 1,352.74 and 607.39

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Solution

The fourth proportional to 980.21, 1,352.74 and 607.39 is: 838.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.21 : 1,352.74 = 607.39 : x
  2. Step 2: Convert to fraction form
    980.21/1,352.74 = 607.39/x
  3. Step 3: Cross multiply
    980.21x = 1,352.74 × 607.39
  4. Step 4: Simplify right side
    980.21x = 821,640.75
  5. Step 5: Solve for x
    x = 821,640.75/980.21
  6. Step 6: Final answer
    x = 838.23

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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.