Finding the Fourth Proportional to 128,914.99, 177,913.40 and 71,559.70
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Solution
The fourth proportional to 128,914.99, 177,913.40 and 71,559.70 is: 98,758.33
Step by Step Solution
- Step 1: Write the proportion equation
128,914.99 : 177,913.40 = 71,559.70 : x - Step 2: Convert to fraction form
128,914.99/177,913.40 = 71,559.70/x - Step 3: Cross multiply
128,914.99x = 177,913.40 × 71,559.70 - Step 4: Simplify right side
128,914.99x = 12,731,429,529.98 - Step 5: Solve for x
x = 12,731,429,529.98/128,914.99 - Step 6: Final answer
x = 98,758.33
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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.