Finding the Fourth Proportional to 1,390,163.21, 1,917,979.11 and 778,225.85
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Solution
The fourth proportional to 1,390,163.21, 1,917,979.11 and 778,225.85 is: 1,073,701.93
Step by Step Solution
- Step 1: Write the proportion equation
1,390,163.21 : 1,917,979.11 = 778,225.85 : x - Step 2: Convert to fraction form
1,390,163.21/1,917,979.11 = 778,225.85/x - Step 3: Cross multiply
1,390,163.21x = 1,917,979.11 × 778,225.85 - Step 4: Simplify right side
1,390,163.21x = 1,492,620,923,161.99 - Step 5: Solve for x
x = 1,492,620,923,161.99/1,390,163.21 - Step 6: Final answer
x = 1,073,701.93
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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.