Finding the Fourth Proportional to 81,271.80, 121,907.70 and 71,430.30
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Solution
The fourth proportional to 81,271.80, 121,907.70 and 71,430.30 is: 107,145.45
Step by Step Solution
- Step 1: Write the proportion equation
81,271.80 : 121,907.70 = 71,430.30 : x - Step 2: Convert to fraction form
81,271.80/121,907.70 = 71,430.30/x - Step 3: Cross multiply
81,271.80x = 121,907.70 × 71,430.30 - Step 4: Simplify right side
81,271.80x = 8,707,903,583.31 - Step 5: Solve for x
x = 8,707,903,583.31/81,271.80 - Step 6: Final answer
x = 107,145.45
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.