Finding the Fourth Proportional to 128,638.80, 177,530.96 and 77,664.08
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Solution
The fourth proportional to 128,638.80, 177,530.96 and 77,664.08 is: 107,182.12
Step by Step Solution
- Step 1: Write the proportion equation
128,638.80 : 177,530.96 = 77,664.08 : x - Step 2: Convert to fraction form
128,638.80/177,530.96 = 77,664.08/x - Step 3: Cross multiply
128,638.80x = 177,530.96 × 77,664.08 - Step 4: Simplify right side
128,638.80x = 13,787,778,679.92 - Step 5: Solve for x
x = 13,787,778,679.92/128,638.80 - Step 6: Final answer
x = 107,182.12
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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.