Finding the Fourth Proportional to 1,278,312,736.97, 1,918,021,499.67 and 687,412,328.06
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Solution
The fourth proportional to 1,278,312,736.97, 1,918,021,499.67 and 687,412,328.06 is: 1,031,415,541.93
Step by Step Solution
- Step 1: Write the proportion equation
1,278,312,736.97 : 1,918,021,499.67 = 687,412,328.06 : x - Step 2: Convert to fraction form
1,278,312,736.97/1,918,021,499.67 = 687,412,328.06/x - Step 3: Cross multiply
1,278,312,736.97x = 1,918,021,499.67 × 687,412,328.06 - Step 4: Simplify right side
1,278,312,736.97x = 1,318,471,624,357,287,168 - Step 5: Solve for x
x = 1,318,471,624,357,287,168/1,278,312,736.97 - Step 6: Final answer
x = 1,031,415,541.93
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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.