Finding the Fourth Proportional to 128,590.36, 177,469.86 and 71,990.80
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Solution
The fourth proportional to 128,590.36, 177,469.86 and 71,990.80 is: 99,355.79
Step by Step Solution
- Step 1: Write the proportion equation
128,590.36 : 177,469.86 = 71,990.80 : x - Step 2: Convert to fraction form
128,590.36/177,469.86 = 71,990.80/x - Step 3: Cross multiply
128,590.36x = 177,469.86 × 71,990.80 - Step 4: Simplify right side
128,590.36x = 12,776,197,197.29 - Step 5: Solve for x
x = 12,776,197,197.29/128,590.36 - Step 6: Final answer
x = 99,355.79
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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.