Finding the Fourth Proportional to 157.18, 216.91 and 91.68
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Solution
The fourth proportional to 157.18, 216.91 and 91.68 is: 126.52
Step by Step Solution
- Step 1: Write the proportion equation
157.18 : 216.91 = 91.68 : x - Step 2: Convert to fraction form
157.18/216.91 = 91.68/x - Step 3: Cross multiply
157.18x = 216.91 × 91.68 - Step 4: Simplify right side
157.18x = 19,886.31 - Step 5: Solve for x
x = 19,886.31/157.18 - Step 6: Final answer
x = 126.52
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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.