Finding the Fourth Proportional to 138,951.74, 191,750.86 and 78,521.09
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Solution
The fourth proportional to 138,951.74, 191,750.86 and 78,521.09 is: 108,357.66
Step by Step Solution
- Step 1: Write the proportion equation
138,951.74 : 191,750.86 = 78,521.09 : x - Step 2: Convert to fraction form
138,951.74/191,750.86 = 78,521.09/x - Step 3: Cross multiply
138,951.74x = 191,750.86 × 78,521.09 - Step 4: Simplify right side
138,951.74x = 15,056,485,675.03 - Step 5: Solve for x
x = 15,056,485,675.03/138,951.74 - Step 6: Final answer
x = 108,357.66
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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.