Finding the Fourth Proportional to 100,640.12, 138,886.88 and 55,319.99
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Solution
The fourth proportional to 100,640.12, 138,886.88 and 55,319.99 is: 76,343.51
Step by Step Solution
- Step 1: Write the proportion equation
100,640.12 : 138,886.88 = 55,319.99 : x - Step 2: Convert to fraction form
100,640.12/138,886.88 = 55,319.99/x - Step 3: Cross multiply
100,640.12x = 138,886.88 × 55,319.99 - Step 4: Simplify right side
100,640.12x = 7,683,219,841.70 - Step 5: Solve for x
x = 7,683,219,841.70/100,640.12 - Step 6: Final answer
x = 76,343.51
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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.