Finding the Fourth Proportional to 7,980.42, 11,970.36 and 2,136.99
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Solution
The fourth proportional to 7,980.42, 11,970.36 and 2,136.99 is: 3,205.41
Step by Step Solution
- Step 1: Write the proportion equation
7,980.42 : 11,970.36 = 2,136.99 : x - Step 2: Convert to fraction form
7,980.42/11,970.36 = 2,136.99/x - Step 3: Cross multiply
7,980.42x = 11,970.36 × 2,136.99 - Step 4: Simplify right side
7,980.42x = 25,580,539.62 - Step 5: Solve for x
x = 25,580,539.62/7,980.42 - Step 6: Final answer
x = 3,205.41
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.