Finding the Fourth Proportional to 72.21, 99.68 and 69.31
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Solution
The fourth proportional to 72.21, 99.68 and 69.31 is: 95.68
Step by Step Solution
- Step 1: Write the proportion equation
72.21 : 99.68 = 69.31 : x - Step 2: Convert to fraction form
72.21/99.68 = 69.31/x - Step 3: Cross multiply
72.21x = 99.68 × 69.31 - Step 4: Simplify right side
72.21x = 6,908.82 - Step 5: Solve for x
x = 6,908.82/72.21 - Step 6: Final answer
x = 95.68
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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.