Finding the Fourth Proportional to 138,876.23, 191,660.99 and 78,457.96
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Solution
The fourth proportional to 138,876.23, 191,660.99 and 78,457.96 is: 108,278.65
Step by Step Solution
- Step 1: Write the proportion equation
138,876.23 : 191,660.99 = 78,457.96 : x - Step 2: Convert to fraction form
138,876.23/191,660.99 = 78,457.96/x - Step 3: Cross multiply
138,876.23x = 191,660.99 × 78,457.96 - Step 4: Simplify right side
138,876.23x = 15,037,330,286.98 - Step 5: Solve for x
x = 15,037,330,286.98/138,876.23 - Step 6: Final answer
x = 108,278.65
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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.