Finding the Fourth Proportional to 80,971.80, 121,457.70 and 71,130.30
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Solution
The fourth proportional to 80,971.80, 121,457.70 and 71,130.30 is: 106,695.45
Step by Step Solution
- Step 1: Write the proportion equation
80,971.80 : 121,457.70 = 71,130.30 : x - Step 2: Convert to fraction form
80,971.80/121,457.70 = 71,130.30/x - Step 3: Cross multiply
80,971.80x = 121,457.70 × 71,130.30 - Step 4: Simplify right side
80,971.80x = 8,639,322,638.31 - Step 5: Solve for x
x = 8,639,322,638.31/80,971.80 - Step 6: Final answer
x = 106,695.45
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1.5x scale
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.