Finding the Fourth Proportional to 211.91, 292.35 and 128.99
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Solution
The fourth proportional to 211.91, 292.35 and 128.99 is: 177.95
Step by Step Solution
- Step 1: Write the proportion equation
211.91 : 292.35 = 128.99 : x - Step 2: Convert to fraction form
211.91/292.35 = 128.99/x - Step 3: Cross multiply
211.91x = 292.35 × 128.99 - Step 4: Simplify right side
211.91x = 37,710.23 - Step 5: Solve for x
x = 37,710.23/211.91 - Step 6: Final answer
x = 177.95
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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.