Finding the Fourth Proportional to 128,919.06, 177,911.37 and 72,334.62
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Solution
The fourth proportional to 128,919.06, 177,911.37 and 72,334.62 is: 99,823.50
Step by Step Solution
- Step 1: Write the proportion equation
128,919.06 : 177,911.37 = 72,334.62 : x - Step 2: Convert to fraction form
128,919.06/177,911.37 = 72,334.62/x - Step 3: Cross multiply
128,919.06x = 177,911.37 × 72,334.62 - Step 4: Simplify right side
128,919.06x = 12,869,151,342.63 - Step 5: Solve for x
x = 12,869,151,342.63/128,919.06 - Step 6: Final answer
x = 99,823.50
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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.