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Finding the Fourth Proportional to 822.20, 1,134.24 and 490.44

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Solution

The fourth proportional to 822.20, 1,134.24 and 490.44 is: 676.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.20 : 1,134.24 = 490.44 : x
  2. Step 2: Convert to fraction form
    822.20/1,134.24 = 490.44/x
  3. Step 3: Cross multiply
    822.20x = 1,134.24 × 490.44
  4. Step 4: Simplify right side
    822.20x = 556,276.67
  5. Step 5: Solve for x
    x = 556,276.67/822.20
  6. Step 6: Final answer
    x = 676.57

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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.