Finding the Fourth Proportional to 639,397,639.80, 959,096,459.70 and 639,397,639.80
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Solution
The fourth proportional to 639,397,639.80, 959,096,459.70 and 639,397,639.80 is: 959,096,459.70
Step by Step Solution
- Step 1: Write the proportion equation
639,397,639.80 : 959,096,459.70 = 639,397,639.80 : x - Step 2: Convert to fraction form
639,397,639.80/959,096,459.70 = 639,397,639.80/x - Step 3: Cross multiply
639,397,639.80x = 959,096,459.70 × 639,397,639.80 - Step 4: Simplify right side
639,397,639.80x = 613,244,012,672,715,776 - Step 5: Solve for x
x = 613,244,012,672,715,776/639,397,639.80 - Step 6: Final answer
x = 959,096,459.70
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Double scale
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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.