Finding the Fourth Proportional to 121.08, 167.09 and 79.70
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Solution
The fourth proportional to 121.08, 167.09 and 79.70 is: 109.99
Step by Step Solution
- Step 1: Write the proportion equation
121.08 : 167.09 = 79.70 : x - Step 2: Convert to fraction form
121.08/167.09 = 79.70/x - Step 3: Cross multiply
121.08x = 167.09 × 79.70 - Step 4: Simplify right side
121.08x = 13,317.00 - Step 5: Solve for x
x = 13,317.00/121.08 - Step 6: Final answer
x = 109.99
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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.