Finding the Fourth Proportional to 991.04, 1,367.16 and 680
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Solution
The fourth proportional to 991.04, 1,367.16 and 680 is: 938.07
Step by Step Solution
- Step 1: Write the proportion equation
991.04 : 1,367.16 = 680 : x - Step 2: Convert to fraction form
991.04/1,367.16 = 680/x - Step 3: Cross multiply
991.04x = 1,367.16 × 680 - Step 4: Simplify right side
991.04x = 929,668.80 - Step 5: Solve for x
x = 929,668.80/991.04 - Step 6: Final answer
x = 938.07
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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.