Finding the Fourth Proportional to 8,221,331.70, 12,331,997.55 and 7,661,459.70
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Solution
The fourth proportional to 8,221,331.70, 12,331,997.55 and 7,661,459.70 is: 11,492,189.55
Step by Step Solution
- Step 1: Write the proportion equation
8,221,331.70 : 12,331,997.55 = 7,661,459.70 : x - Step 2: Convert to fraction form
8,221,331.70/12,331,997.55 = 7,661,459.70/x - Step 3: Cross multiply
8,221,331.70x = 12,331,997.55 × 7,661,459.70 - Step 4: Simplify right side
8,221,331.70x = 94,481,102,249,823.75 - Step 5: Solve for x
x = 94,481,102,249,823.75/8,221,331.70 - Step 6: Final answer
x = 11,492,189.55
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Double scale
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Similar ratio
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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.