Finding the Fourth Proportional to 128,919.08, 177,905.57 and 71,555.06
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Solution
The fourth proportional to 128,919.08, 177,905.57 and 71,555.06 is: 98,744.45
Step by Step Solution
- Step 1: Write the proportion equation
128,919.08 : 177,905.57 = 71,555.06 : x - Step 2: Convert to fraction form
128,919.08/177,905.57 = 71,555.06/x - Step 3: Cross multiply
128,919.08x = 177,905.57 × 71,555.06 - Step 4: Simplify right side
128,919.08x = 12,730,043,735.68 - Step 5: Solve for x
x = 12,730,043,735.68/128,919.08 - Step 6: Final answer
x = 98,744.45
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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.