Finding the Fourth Proportional to 128,718.45, 177,602.49 and 77,739.48
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Solution
The fourth proportional to 128,718.45, 177,602.49 and 77,739.48 is: 107,262.99
Step by Step Solution
- Step 1: Write the proportion equation
128,718.45 : 177,602.49 = 77,739.48 : x - Step 2: Convert to fraction form
128,718.45/177,602.49 = 77,739.48/x - Step 3: Cross multiply
128,718.45x = 177,602.49 × 77,739.48 - Step 4: Simplify right side
128,718.45x = 13,806,725,219.31 - Step 5: Solve for x
x = 13,806,725,219.31/128,718.45 - Step 6: Final answer
x = 107,262.99
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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.