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Finding the Fourth Proportional to 667.20, 919.44 and 620.22

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Solution

The fourth proportional to 667.20, 919.44 and 620.22 is: 854.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.20 : 919.44 = 620.22 : x
  2. Step 2: Convert to fraction form
    667.20/919.44 = 620.22/x
  3. Step 3: Cross multiply
    667.20x = 919.44 × 620.22
  4. Step 4: Simplify right side
    667.20x = 570,255.08
  5. Step 5: Solve for x
    x = 570,255.08/667.20
  6. Step 6: Final answer
    x = 854.70

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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.