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Finding the Fourth Proportional to 980.87, 1,352.18 and 685.22

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Solution

The fourth proportional to 980.87, 1,352.18 and 685.22 is: 944.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.87 : 1,352.18 = 685.22 : x
  2. Step 2: Convert to fraction form
    980.87/1,352.18 = 685.22/x
  3. Step 3: Cross multiply
    980.87x = 1,352.18 × 685.22
  4. Step 4: Simplify right side
    980.87x = 926,537.35
  5. Step 5: Solve for x
    x = 926,537.35/980.87
  6. Step 6: Final answer
    x = 944.61

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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.