Finding the Fourth Proportional to 100,386.21, 138,518.16 and 64,624.68
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Solution
The fourth proportional to 100,386.21, 138,518.16 and 64,624.68 is: 89,172.52
Step by Step Solution
- Step 1: Write the proportion equation
100,386.21 : 138,518.16 = 64,624.68 : x - Step 2: Convert to fraction form
100,386.21/138,518.16 = 64,624.68/x - Step 3: Cross multiply
100,386.21x = 138,518.16 × 64,624.68 - Step 4: Simplify right side
100,386.21x = 8,951,691,764.19 - Step 5: Solve for x
x = 8,951,691,764.19/100,386.21 - Step 6: Final answer
x = 89,172.52
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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.