Finding the Fourth Proportional to 138.60, 191.26 and 79.58
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Solution
The fourth proportional to 138.60, 191.26 and 79.58 is: 109.82
Step by Step Solution
- Step 1: Write the proportion equation
138.60 : 191.26 = 79.58 : x - Step 2: Convert to fraction form
138.60/191.26 = 79.58/x - Step 3: Cross multiply
138.60x = 191.26 × 79.58 - Step 4: Simplify right side
138.60x = 15,220.75 - Step 5: Solve for x
x = 15,220.75/138.60 - Step 6: Final answer
x = 109.82
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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.