Finding the Third Proportional to 1,920 and 3,120
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Solution
The third proportional to 1,920 and 3,120 is: 5,070
Step by Step Solution
- Step 1: Write the proportion equation
1,920 : 3,120 = 3,120 : x - Step 2: Convert to fraction form
1,920/3,120 = 3,120/x - Step 3: Cross multiply
1,920x = 3,120 × 3,120 - Step 4: Simplify right side
1,920x = 9,734,400 - Step 5: Solve for x
x = 9,734,400/1,920 - Step 6: Final answer
x = 5,070
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These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.