Finding the Fourth Proportional to 128,955.84, 177,976.44 and 72,370.32
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Solution
The fourth proportional to 128,955.84, 177,976.44 and 72,370.32 is: 99,880.80
Step by Step Solution
- Step 1: Write the proportion equation
128,955.84 : 177,976.44 = 72,370.32 : x - Step 2: Convert to fraction form
128,955.84/177,976.44 = 72,370.32/x - Step 3: Cross multiply
128,955.84x = 177,976.44 × 72,370.32 - Step 4: Simplify right side
128,955.84x = 12,880,211,915.26 - Step 5: Solve for x
x = 12,880,211,915.26/128,955.84 - Step 6: Final answer
x = 99,880.80
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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.