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Finding the Fourth Proportional to 809.56, 1,214.46 and 419

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Solution

The fourth proportional to 809.56, 1,214.46 and 419 is: 628.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.56 : 1,214.46 = 419 : x
  2. Step 2: Convert to fraction form
    809.56/1,214.46 = 419/x
  3. Step 3: Cross multiply
    809.56x = 1,214.46 × 419
  4. Step 4: Simplify right side
    809.56x = 508,858.74
  5. Step 5: Solve for x
    x = 508,858.74/809.56
  6. Step 6: Final answer
    x = 628.56

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Double scale
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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.