Finding the Fourth Proportional to 1,405.05, 1,938.97 and 784.05
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Solution
The fourth proportional to 1,405.05, 1,938.97 and 784.05 is: 1,081.99
Step by Step Solution
- Step 1: Write the proportion equation
1,405.05 : 1,938.97 = 784.05 : x - Step 2: Convert to fraction form
1,405.05/1,938.97 = 784.05/x - Step 3: Cross multiply
1,405.05x = 1,938.97 × 784.05 - Step 4: Simplify right side
1,405.05x = 1,520,240.66 - Step 5: Solve for x
x = 1,520,240.66/1,405.05 - Step 6: Final answer
x = 1,081.99
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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.