Finding the Fourth Proportional to 138,055.08, 190,515.06 and 78,439.08
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Solution
The fourth proportional to 138,055.08, 190,515.06 and 78,439.08 is: 108,245.39
Step by Step Solution
- Step 1: Write the proportion equation
138,055.08 : 190,515.06 = 78,439.08 : x - Step 2: Convert to fraction form
138,055.08/190,515.06 = 78,439.08/x - Step 3: Cross multiply
138,055.08x = 190,515.06 × 78,439.08 - Step 4: Simplify right side
138,055.08x = 14,943,826,032.54 - Step 5: Solve for x
x = 14,943,826,032.54/138,055.08 - Step 6: Final answer
x = 108,245.39
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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.