Finding the Fourth Proportional to 128,640.80, 177,533.72 and 77,666.08
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Solution
The fourth proportional to 128,640.80, 177,533.72 and 77,666.08 is: 107,184.88
Step by Step Solution
- Step 1: Write the proportion equation
128,640.80 : 177,533.72 = 77,666.08 : x - Step 2: Convert to fraction form
128,640.80/177,533.72 = 77,666.08/x - Step 3: Cross multiply
128,640.80x = 177,533.72 × 77,666.08 - Step 4: Simplify right side
128,640.80x = 13,788,348,100.22 - Step 5: Solve for x
x = 13,788,348,100.22/128,640.80 - Step 6: Final answer
x = 107,184.88
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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.