Finding the Fourth Proportional to 100,721.17, 138,995.49 and 55,403.80
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Solution
The fourth proportional to 100,721.17, 138,995.49 and 55,403.80 is: 76,457.39
Step by Step Solution
- Step 1: Write the proportion equation
100,721.17 : 138,995.49 = 55,403.80 : x - Step 2: Convert to fraction form
100,721.17/138,995.49 = 55,403.80/x - Step 3: Cross multiply
100,721.17x = 138,995.49 × 55,403.80 - Step 4: Simplify right side
100,721.17x = 7,700,878,189.14 - Step 5: Solve for x
x = 7,700,878,189.14/100,721.17 - Step 6: Final answer
x = 76,457.39
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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.