Finding the Fourth Proportional to 128,948.49, 177,948.99 and 72,359.85
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Solution
The fourth proportional to 128,948.49, 177,948.99 and 72,359.85 is: 99,856.63
Step by Step Solution
- Step 1: Write the proportion equation
128,948.49 : 177,948.99 = 72,359.85 : x - Step 2: Convert to fraction form
128,948.49/177,948.99 = 72,359.85/x - Step 3: Cross multiply
128,948.49x = 177,948.99 × 72,359.85 - Step 4: Simplify right side
128,948.49x = 12,876,362,224.05 - Step 5: Solve for x
x = 12,876,362,224.05/128,948.49 - Step 6: Final answer
x = 99,856.63
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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.