Finding the Fourth Proportional to 91.39, 135.99 and 91.09
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Solution
The fourth proportional to 91.39, 135.99 and 91.09 is: 135.54
Step by Step Solution
- Step 1: Write the proportion equation
91.39 : 135.99 = 91.09 : x - Step 2: Convert to fraction form
91.39/135.99 = 91.09/x - Step 3: Cross multiply
91.39x = 135.99 × 91.09 - Step 4: Simplify right side
91.39x = 12,387.07 - Step 5: Solve for x
x = 12,387.07/91.39 - Step 6: Final answer
x = 135.54
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.