Finding the Fourth Proportional to 21,236,495.68, 29,308,612.70 and 12,981,390.12
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Solution
The fourth proportional to 21,236,495.68, 29,308,612.70 and 12,981,390.12 is: 17,915,692.92
Step by Step Solution
- Step 1: Write the proportion equation
21,236,495.68 : 29,308,612.70 = 12,981,390.12 : x - Step 2: Convert to fraction form
21,236,495.68/29,308,612.70 = 12,981,390.12/x - Step 3: Cross multiply
21,236,495.68x = 29,308,612.70 × 12,981,390.12 - Step 4: Simplify right side
21,236,495.68x = 380,466,535,367,140 - Step 5: Solve for x
x = 380,466,535,367,140/21,236,495.68 - Step 6: Final answer
x = 17,915,692.92
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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.