Finding the Fourth Proportional to 128,637.40, 177,463.02 and 77,621.70
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Solution
The fourth proportional to 128,637.40, 177,463.02 and 77,621.70 is: 107,083.80
Step by Step Solution
- Step 1: Write the proportion equation
128,637.40 : 177,463.02 = 77,621.70 : x - Step 2: Convert to fraction form
128,637.40/177,463.02 = 77,621.70/x - Step 3: Cross multiply
128,637.40x = 177,463.02 × 77,621.70 - Step 4: Simplify right side
128,637.40x = 13,774,981,299.53 - Step 5: Solve for x
x = 13,774,981,299.53/128,637.40 - Step 6: Final answer
x = 107,083.80
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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.