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Finding the Fourth Proportional to 919.36, 1,268.26 and 624.80

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Solution

The fourth proportional to 919.36, 1,268.26 and 624.80 is: 861.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.36 : 1,268.26 = 624.80 : x
  2. Step 2: Convert to fraction form
    919.36/1,268.26 = 624.80/x
  3. Step 3: Cross multiply
    919.36x = 1,268.26 × 624.80
  4. Step 4: Simplify right side
    919.36x = 792,408.85
  5. Step 5: Solve for x
    x = 792,408.85/919.36
  6. Step 6: Final answer
    x = 861.91

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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.