Finding the Fourth Proportional to 85,936.70, 128,905.05 and 84,770.30
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Solution
The fourth proportional to 85,936.70, 128,905.05 and 84,770.30 is: 127,155.45
Step by Step Solution
- Step 1: Write the proportion equation
85,936.70 : 128,905.05 = 84,770.30 : x - Step 2: Convert to fraction form
85,936.70/128,905.05 = 84,770.30/x - Step 3: Cross multiply
85,936.70x = 128,905.05 × 84,770.30 - Step 4: Simplify right side
85,936.70x = 10,927,319,760.02 - Step 5: Solve for x
x = 10,927,319,760.02/85,936.70 - Step 6: Final answer
x = 127,155.45
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Similar ratio
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.