Finding the Fourth Proportional to 79.68, 109.68 and 68.70
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Solution
The fourth proportional to 79.68, 109.68 and 68.70 is: 94.57
Step by Step Solution
- Step 1: Write the proportion equation
79.68 : 109.68 = 68.70 : x - Step 2: Convert to fraction form
79.68/109.68 = 68.70/x - Step 3: Cross multiply
79.68x = 109.68 × 68.70 - Step 4: Simplify right side
79.68x = 7,535.02 - Step 5: Solve for x
x = 7,535.02/79.68 - Step 6: Final answer
x = 94.57
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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.