Finding the Fourth Proportional to 128,957.24, 177,961.08 and 72,368.60
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Solution
The fourth proportional to 128,957.24, 177,961.08 and 72,368.60 is: 99,868.72
Step by Step Solution
- Step 1: Write the proportion equation
128,957.24 : 177,961.08 = 72,368.60 : x - Step 2: Convert to fraction form
128,957.24/177,961.08 = 72,368.60/x - Step 3: Cross multiply
128,957.24x = 177,961.08 × 72,368.60 - Step 4: Simplify right side
128,957.24x = 12,878,794,214.09 - Step 5: Solve for x
x = 12,878,794,214.09/128,957.24 - Step 6: Final answer
x = 99,868.72
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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.