Finding the Fourth Proportional to 128,957.06, 177,977.45 and 72,368.44
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Solution
The fourth proportional to 128,957.06, 177,977.45 and 72,368.44 is: 99,877.82
Step by Step Solution
- Step 1: Write the proportion equation
128,957.06 : 177,977.45 = 72,368.44 : x - Step 2: Convert to fraction form
128,957.06/177,977.45 = 72,368.44/x - Step 3: Cross multiply
128,957.06x = 177,977.45 × 72,368.44 - Step 4: Simplify right side
128,957.06x = 12,879,950,147.66 - Step 5: Solve for x
x = 12,879,950,147.66/128,957.06 - Step 6: Final answer
x = 99,877.82
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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.