Finding the Fourth Proportional to 128,240.05, 176,992.79 and 86,828.26
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Solution
The fourth proportional to 128,240.05, 176,992.79 and 86,828.26 is: 119,837.57
Step by Step Solution
- Step 1: Write the proportion equation
128,240.05 : 176,992.79 = 86,828.26 : x - Step 2: Convert to fraction form
128,240.05/176,992.79 = 86,828.26/x - Step 3: Cross multiply
128,240.05x = 176,992.79 × 86,828.26 - Step 4: Simplify right side
128,240.05x = 15,367,975,988.25 - Step 5: Solve for x
x = 15,367,975,988.25/128,240.05 - Step 6: Final answer
x = 119,837.57
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1.5x scale
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.