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Finding the Fourth Proportional to 828.20, 1,242.30 and 396.20

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Solution

The fourth proportional to 828.20, 1,242.30 and 396.20 is: 594.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.20 : 1,242.30 = 396.20 : x
  2. Step 2: Convert to fraction form
    828.20/1,242.30 = 396.20/x
  3. Step 3: Cross multiply
    828.20x = 1,242.30 × 396.20
  4. Step 4: Simplify right side
    828.20x = 492,199.26
  5. Step 5: Solve for x
    x = 492,199.26/828.20
  6. Step 6: Final answer
    x = 594.30

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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.