Finding the Fourth Proportional to 115,961.87, 160,105.34 and 72,420.75
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Solution
The fourth proportional to 115,961.87, 160,105.34 and 72,420.75 is: 99,989.32
Step by Step Solution
- Step 1: Write the proportion equation
115,961.87 : 160,105.34 = 72,420.75 : x - Step 2: Convert to fraction form
115,961.87/160,105.34 = 72,420.75/x - Step 3: Cross multiply
115,961.87x = 160,105.34 × 72,420.75 - Step 4: Simplify right side
115,961.87x = 11,594,948,318.12 - Step 5: Solve for x
x = 11,594,948,318.12/115,961.87 - Step 6: Final answer
x = 99,989.32
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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.