Finding the Fourth Proportional to 1,187,368.21, 1,638,563.91 and 643,517.20
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Solution
The fourth proportional to 1,187,368.21, 1,638,563.91 and 643,517.20 is: 888,051.45
Step by Step Solution
- Step 1: Write the proportion equation
1,187,368.21 : 1,638,563.91 = 643,517.20 : x - Step 2: Convert to fraction form
1,187,368.21/1,638,563.91 = 643,517.20/x - Step 3: Cross multiply
1,187,368.21x = 1,638,563.91 × 643,517.20 - Step 4: Simplify right side
1,187,368.21x = 1,054,444,051,191.43 - Step 5: Solve for x
x = 1,054,444,051,191.43/1,187,368.21 - Step 6: Final answer
x = 888,051.45
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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.