Finding the Fourth Proportional to 138,640,971.39, 191,330,519.16 and 76,761,309.75
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Solution
The fourth proportional to 138,640,971.39, 191,330,519.16 and 76,761,309.75 is: 105,933,917.65
Step by Step Solution
- Step 1: Write the proportion equation
138,640,971.39 : 191,330,519.16 = 76,761,309.75 : x - Step 2: Convert to fraction form
138,640,971.39/191,330,519.16 = 76,761,309.75/x - Step 3: Cross multiply
138,640,971.39x = 191,330,519.16 × 76,761,309.75 - Step 4: Simplify right side
138,640,971.39x = 14,686,781,245,869,070 - Step 5: Solve for x
x = 14,686,781,245,869,070/138,640,971.39 - Step 6: Final answer
x = 105,933,917.65
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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.