Finding the Fourth Proportional to 91,889.70, 128,776.80 and 91,889.70
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Solution
The fourth proportional to 91,889.70, 128,776.80 and 91,889.70 is: 128,776.80
Step by Step Solution
- Step 1: Write the proportion equation
91,889.70 : 128,776.80 = 91,889.70 : x - Step 2: Convert to fraction form
91,889.70/128,776.80 = 91,889.70/x - Step 3: Cross multiply
91,889.70x = 128,776.80 × 91,889.70 - Step 4: Simplify right side
91,889.70x = 11,833,261,518.96 - Step 5: Solve for x
x = 11,833,261,518.96/91,889.70 - Step 6: Final answer
x = 128,776.80
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.