Finding the Fourth Proportional to 128,580.36, 177,456.06 and 71,980.80
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Solution
The fourth proportional to 128,580.36, 177,456.06 and 71,980.80 is: 99,341.99
Step by Step Solution
- Step 1: Write the proportion equation
128,580.36 : 177,456.06 = 71,980.80 : x - Step 2: Convert to fraction form
128,580.36/177,456.06 = 71,980.80/x - Step 3: Cross multiply
128,580.36x = 177,456.06 × 71,980.80 - Step 4: Simplify right side
128,580.36x = 12,773,429,163.65 - Step 5: Solve for x
x = 12,773,429,163.65/128,580.36 - Step 6: Final answer
x = 99,341.99
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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.