Finding the Fourth Proportional to 142,653.21, 196,861.40 and 78,990.99
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Solution
The fourth proportional to 142,653.21, 196,861.40 and 78,990.99 is: 109,007.55
Step by Step Solution
- Step 1: Write the proportion equation
142,653.21 : 196,861.40 = 78,990.99 : x - Step 2: Convert to fraction form
142,653.21/196,861.40 = 78,990.99/x - Step 3: Cross multiply
142,653.21x = 196,861.40 × 78,990.99 - Step 4: Simplify right side
142,653.21x = 15,550,276,483.83 - Step 5: Solve for x
x = 15,550,276,483.83/142,653.21 - Step 6: Final answer
x = 109,007.55
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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.