Finding the Fourth Proportional to 12,478,640.70, 18,717,961.05 and 7,439,792.70
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Solution
The fourth proportional to 12,478,640.70, 18,717,961.05 and 7,439,792.70 is: 11,159,689.05
Step by Step Solution
- Step 1: Write the proportion equation
12,478,640.70 : 18,717,961.05 = 7,439,792.70 : x - Step 2: Convert to fraction form
12,478,640.70/18,717,961.05 = 7,439,792.70/x - Step 3: Cross multiply
12,478,640.70x = 18,717,961.05 × 7,439,792.70 - Step 4: Simplify right side
12,478,640.70x = 139,257,749,978,674.34 - Step 5: Solve for x
x = 139,257,749,978,674.34/12,478,640.70 - Step 6: Final answer
x = 11,159,689.05
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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.