Finding the Fourth Proportional to 129,139.23, 178,203.48 and 71,774.82
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Solution
The fourth proportional to 129,139.23, 178,203.48 and 71,774.82 is: 99,044.45
Step by Step Solution
- Step 1: Write the proportion equation
129,139.23 : 178,203.48 = 71,774.82 : x - Step 2: Convert to fraction form
129,139.23/178,203.48 = 71,774.82/x - Step 3: Cross multiply
129,139.23x = 178,203.48 × 71,774.82 - Step 4: Simplify right side
129,139.23x = 12,790,523,538.02 - Step 5: Solve for x
x = 12,790,523,538.02/129,139.23 - Step 6: Final answer
x = 99,044.45
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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.