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Finding the Fourth Proportional to 980.20, 1,352.96 and 685.54

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Solution

The fourth proportional to 980.20, 1,352.96 and 685.54 is: 946.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.20 : 1,352.96 = 685.54 : x
  2. Step 2: Convert to fraction form
    980.20/1,352.96 = 685.54/x
  3. Step 3: Cross multiply
    980.20x = 1,352.96 × 685.54
  4. Step 4: Simplify right side
    980.20x = 927,508.20
  5. Step 5: Solve for x
    x = 927,508.20/980.20
  6. Step 6: Final answer
    x = 946.24

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1.5x scale

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.