Finding the Fourth Proportional to 117.21, 161.89 and 86.07
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Solution
The fourth proportional to 117.21, 161.89 and 86.07 is: 118.88
Step by Step Solution
- Step 1: Write the proportion equation
117.21 : 161.89 = 86.07 : x - Step 2: Convert to fraction form
117.21/161.89 = 86.07/x - Step 3: Cross multiply
117.21x = 161.89 × 86.07 - Step 4: Simplify right side
117.21x = 13,933.87 - Step 5: Solve for x
x = 13,933.87/117.21 - Step 6: Final answer
x = 118.88
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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.