Finding the Fourth Proportional to 81,990.12, 112,908.14 and 71,230.08
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Solution
The fourth proportional to 81,990.12, 112,908.14 and 71,230.08 is: 98,090.55
Step by Step Solution
- Step 1: Write the proportion equation
81,990.12 : 112,908.14 = 71,230.08 : x - Step 2: Convert to fraction form
81,990.12/112,908.14 = 71,230.08/x - Step 3: Cross multiply
81,990.12x = 112,908.14 × 71,230.08 - Step 4: Simplify right side
81,990.12x = 8,042,455,844.85 - Step 5: Solve for x
x = 8,042,455,844.85/81,990.12 - Step 6: Final answer
x = 98,090.55
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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.