Finding the Fourth Proportional to 103.72, 143.04 and 70.99
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Solution
The fourth proportional to 103.72, 143.04 and 70.99 is: 97.90
Step by Step Solution
- Step 1: Write the proportion equation
103.72 : 143.04 = 70.99 : x - Step 2: Convert to fraction form
103.72/143.04 = 70.99/x - Step 3: Cross multiply
103.72x = 143.04 × 70.99 - Step 4: Simplify right side
103.72x = 10,154.41 - Step 5: Solve for x
x = 10,154.41/103.72 - Step 6: Final answer
x = 97.90
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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.