Finding the Fourth Proportional to 128,439.42, 177,246.90 and 71,850.84
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Solution
The fourth proportional to 128,439.42, 177,246.90 and 71,850.84 is: 99,154.44
Step by Step Solution
- Step 1: Write the proportion equation
128,439.42 : 177,246.90 = 71,850.84 : x - Step 2: Convert to fraction form
128,439.42/177,246.90 = 71,850.84/x - Step 3: Cross multiply
128,439.42x = 177,246.90 × 71,850.84 - Step 4: Simplify right side
128,439.42x = 12,735,338,652.40 - Step 5: Solve for x
x = 12,735,338,652.40/128,439.42 - Step 6: Final answer
x = 99,154.44
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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.