Finding the Fourth Proportional to 128,707.23, 177,419.09 and 90,359.19
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Solution
The fourth proportional to 128,707.23, 177,419.09 and 90,359.19 is: 124,557.46
Step by Step Solution
- Step 1: Write the proportion equation
128,707.23 : 177,419.09 = 90,359.19 : x - Step 2: Convert to fraction form
128,707.23/177,419.09 = 90,359.19/x - Step 3: Cross multiply
128,707.23x = 177,419.09 × 90,359.19 - Step 4: Simplify right side
128,707.23x = 16,031,445,262.94 - Step 5: Solve for x
x = 16,031,445,262.94/128,707.23 - Step 6: Final answer
x = 124,557.46
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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.