Finding the Fourth Proportional to 128,645.19, 177,530.36 and 78,344.19
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Solution
The fourth proportional to 128,645.19, 177,530.36 and 78,344.19 is: 108,114.98
Step by Step Solution
- Step 1: Write the proportion equation
128,645.19 : 177,530.36 = 78,344.19 : x - Step 2: Convert to fraction form
128,645.19/177,530.36 = 78,344.19/x - Step 3: Cross multiply
128,645.19x = 177,530.36 × 78,344.19 - Step 4: Simplify right side
128,645.19x = 13,908,472,254.61 - Step 5: Solve for x
x = 13,908,472,254.61/128,645.19 - Step 6: Final answer
x = 108,114.98
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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.