Finding the Fourth Proportional to 72.84, 109.41 and 70.56
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Solution
The fourth proportional to 72.84, 109.41 and 70.56 is: 105.99
Step by Step Solution
- Step 1: Write the proportion equation
72.84 : 109.41 = 70.56 : x - Step 2: Convert to fraction form
72.84/109.41 = 70.56/x - Step 3: Cross multiply
72.84x = 109.41 × 70.56 - Step 4: Simplify right side
72.84x = 7,719.97 - Step 5: Solve for x
x = 7,719.97/72.84 - Step 6: Final answer
x = 105.99
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.