Finding the Fourth Proportional to 85,979.11, 128,270.49 and 81,328.87
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Solution
The fourth proportional to 85,979.11, 128,270.49 and 81,328.87 is: 121,332.89
Step by Step Solution
- Step 1: Write the proportion equation
85,979.11 : 128,270.49 = 81,328.87 : x - Step 2: Convert to fraction form
85,979.11/128,270.49 = 81,328.87/x - Step 3: Cross multiply
85,979.11x = 128,270.49 × 81,328.87 - Step 4: Simplify right side
85,979.11x = 10,432,094,006.05 - Step 5: Solve for x
x = 10,432,094,006.05/85,979.11 - Step 6: Final answer
x = 121,332.89
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.