Finding the Fourth Proportional to 79.84, 110.40 and 76.08
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Solution
The fourth proportional to 79.84, 110.40 and 76.08 is: 105.20
Step by Step Solution
- Step 1: Write the proportion equation
79.84 : 110.40 = 76.08 : x - Step 2: Convert to fraction form
79.84/110.40 = 76.08/x - Step 3: Cross multiply
79.84x = 110.40 × 76.08 - Step 4: Simplify right side
79.84x = 8,399.23 - Step 5: Solve for x
x = 8,399.23/79.84 - Step 6: Final answer
x = 105.20
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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.