Finding the Fourth Proportional to 128,309.36, 177,074.79 and 71,720.74
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Solution
The fourth proportional to 128,309.36, 177,074.79 and 71,720.74 is: 98,979.02
Step by Step Solution
- Step 1: Write the proportion equation
128,309.36 : 177,074.79 = 71,720.74 : x - Step 2: Convert to fraction form
128,309.36/177,074.79 = 71,720.74/x - Step 3: Cross multiply
128,309.36x = 177,074.79 × 71,720.74 - Step 4: Simplify right side
128,309.36x = 12,699,934,088.77 - Step 5: Solve for x
x = 12,699,934,088.77/128,309.36 - Step 6: Final answer
x = 98,979.02
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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.