Finding the Fourth Proportional to 1,389,609.72, 1,916,138.61 and 905,276.70
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Solution
The fourth proportional to 1,389,609.72, 1,916,138.61 and 905,276.70 is: 1,248,289.80
Step by Step Solution
- Step 1: Write the proportion equation
1,389,609.72 : 1,916,138.61 = 905,276.70 : x - Step 2: Convert to fraction form
1,389,609.72/1,916,138.61 = 905,276.70/x - Step 3: Cross multiply
1,389,609.72x = 1,916,138.61 × 905,276.70 - Step 4: Simplify right side
1,389,609.72x = 1,734,635,637,603.39 - Step 5: Solve for x
x = 1,734,635,637,603.39/1,389,609.72 - Step 6: Final answer
x = 1,248,289.80
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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.