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Finding the Fourth Proportional to 609.12, 839.61 and 451.51

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Solution

The fourth proportional to 609.12, 839.61 and 451.51 is: 622.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.12 : 839.61 = 451.51 : x
  2. Step 2: Convert to fraction form
    609.12/839.61 = 451.51/x
  3. Step 3: Cross multiply
    609.12x = 839.61 × 451.51
  4. Step 4: Simplify right side
    609.12x = 379,090.21
  5. Step 5: Solve for x
    x = 379,090.21/609.12
  6. Step 6: Final answer
    x = 622.36

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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.