Finding the Fourth Proportional to 128,644.19, 177,528.98 and 78,343.19
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Solution
The fourth proportional to 128,644.19, 177,528.98 and 78,343.19 is: 108,113.60
Step by Step Solution
- Step 1: Write the proportion equation
128,644.19 : 177,528.98 = 78,343.19 : x - Step 2: Convert to fraction form
128,644.19/177,528.98 = 78,343.19/x - Step 3: Cross multiply
128,644.19x = 177,528.98 × 78,343.19 - Step 4: Simplify right side
128,644.19x = 13,908,186,610.65 - Step 5: Solve for x
x = 13,908,186,610.65/128,644.19 - Step 6: Final answer
x = 108,113.60
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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.