Finding the Fourth Proportional to 131.21, 181.06 and 72.99
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Solution
The fourth proportional to 131.21, 181.06 and 72.99 is: 100.72
Step by Step Solution
- Step 1: Write the proportion equation
131.21 : 181.06 = 72.99 : x - Step 2: Convert to fraction form
131.21/181.06 = 72.99/x - Step 3: Cross multiply
131.21x = 181.06 × 72.99 - Step 4: Simplify right side
131.21x = 13,215.39 - Step 5: Solve for x
x = 13,215.39/131.21 - Step 6: Final answer
x = 100.72
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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.