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Finding the Fourth Proportional to 1,213.38, 1,821.74 and 628.86

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Solution

The fourth proportional to 1,213.38, 1,821.74 and 628.86 is: 944.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.38 : 1,821.74 = 628.86 : x
  2. Step 2: Convert to fraction form
    1,213.38/1,821.74 = 628.86/x
  3. Step 3: Cross multiply
    1,213.38x = 1,821.74 × 628.86
  4. Step 4: Simplify right side
    1,213.38x = 1,145,616.27
  5. Step 5: Solve for x
    x = 1,145,616.27/1,213.38
  6. Step 6: Final answer
    x = 944.15

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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.