Finding the Fourth Proportional to 1,138.99, 1,571.10 and 718.99
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Solution
The fourth proportional to 1,138.99, 1,571.10 and 718.99 is: 991.76
Step by Step Solution
- Step 1: Write the proportion equation
1,138.99 : 1,571.10 = 718.99 : x - Step 2: Convert to fraction form
1,138.99/1,571.10 = 718.99/x - Step 3: Cross multiply
1,138.99x = 1,571.10 × 718.99 - Step 4: Simplify right side
1,138.99x = 1,129,605.19 - Step 5: Solve for x
x = 1,129,605.19/1,138.99 - Step 6: Final answer
x = 991.76
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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.