Finding the Fourth Proportional to 138.99, 208.53 and 70.53
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Solution
The fourth proportional to 138.99, 208.53 and 70.53 is: 105.82
Step by Step Solution
- Step 1: Write the proportion equation
138.99 : 208.53 = 70.53 : x - Step 2: Convert to fraction form
138.99/208.53 = 70.53/x - Step 3: Cross multiply
138.99x = 208.53 × 70.53 - Step 4: Simplify right side
138.99x = 14,707.62 - Step 5: Solve for x
x = 14,707.62/138.99 - Step 6: Final answer
x = 105.82
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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.