Finding the Fourth Proportional to 128,949.84, 177,968.16 and 72,364.32
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Solution
The fourth proportional to 128,949.84, 177,968.16 and 72,364.32 is: 99,872.52
Step by Step Solution
- Step 1: Write the proportion equation
128,949.84 : 177,968.16 = 72,364.32 : x - Step 2: Convert to fraction form
128,949.84/177,968.16 = 72,364.32/x - Step 3: Cross multiply
128,949.84x = 177,968.16 × 72,364.32 - Step 4: Simplify right side
128,949.84x = 12,878,544,880.05 - Step 5: Solve for x
x = 12,878,544,880.05/128,949.84 - Step 6: Final answer
x = 99,872.52
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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.