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Finding the Fourth Proportional to 1,321.22, 1,981.68 and 628.34

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Solution

The fourth proportional to 1,321.22, 1,981.68 and 628.34 is: 942.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.22 : 1,981.68 = 628.34 : x
  2. Step 2: Convert to fraction form
    1,321.22/1,981.68 = 628.34/x
  3. Step 3: Cross multiply
    1,321.22x = 1,981.68 × 628.34
  4. Step 4: Simplify right side
    1,321.22x = 1,245,168.81
  5. Step 5: Solve for x
    x = 1,245,168.81/1,321.22
  6. Step 6: Final answer
    x = 942.44

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1.5x scale

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.