Finding the Fourth Proportional to 128,990.08, 178,010.88 and 75,309.44
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Solution
The fourth proportional to 128,990.08, 178,010.88 and 75,309.44 is: 103,929.70
Step by Step Solution
- Step 1: Write the proportion equation
128,990.08 : 178,010.88 = 75,309.44 : x - Step 2: Convert to fraction form
128,990.08/178,010.88 = 75,309.44/x - Step 3: Cross multiply
128,990.08x = 178,010.88 × 75,309.44 - Step 4: Simplify right side
128,990.08x = 13,405,899,686.71 - Step 5: Solve for x
x = 13,405,899,686.71/128,990.08 - Step 6: Final answer
x = 103,929.70
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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.