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Finding the Fourth Proportional to 829.21, 1,144.31 and 456.20

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Solution

The fourth proportional to 829.21, 1,144.31 and 456.20 is: 629.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.21 : 1,144.31 = 456.20 : x
  2. Step 2: Convert to fraction form
    829.21/1,144.31 = 456.20/x
  3. Step 3: Cross multiply
    829.21x = 1,144.31 × 456.20
  4. Step 4: Simplify right side
    829.21x = 522,035.98
  5. Step 5: Solve for x
    x = 522,035.98/829.21
  6. Step 6: Final answer
    x = 629.56

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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.