Finding the Fourth Proportional to 128,021.75, 191,981.28 and 53,090.99
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Solution
The fourth proportional to 128,021.75, 191,981.28 and 53,090.99 is: 79,615.19
Step by Step Solution
- Step 1: Write the proportion equation
128,021.75 : 191,981.28 = 53,090.99 : x - Step 2: Convert to fraction form
128,021.75/191,981.28 = 53,090.99/x - Step 3: Cross multiply
128,021.75x = 191,981.28 × 53,090.99 - Step 4: Simplify right side
128,021.75x = 10,192,476,216.67 - Step 5: Solve for x
x = 10,192,476,216.67/128,021.75 - Step 6: Final answer
x = 79,615.19
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1.5x scale
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.