Finding the Fourth Proportional to 138,561.98, 191,199.28 and 78,129.02
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Solution
The fourth proportional to 138,561.98, 191,199.28 and 78,129.02 is: 107,808.88
Step by Step Solution
- Step 1: Write the proportion equation
138,561.98 : 191,199.28 = 78,129.02 : x - Step 2: Convert to fraction form
138,561.98/191,199.28 = 78,129.02/x - Step 3: Cross multiply
138,561.98x = 191,199.28 × 78,129.02 - Step 4: Simplify right side
138,561.98x = 14,938,212,371.11 - Step 5: Solve for x
x = 14,938,212,371.11/138,561.98 - Step 6: Final answer
x = 107,808.88
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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.