Finding the Fourth Proportional to 12,128,413.80, 18,192,620.70 and 8,709,476.70
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Solution
The fourth proportional to 12,128,413.80, 18,192,620.70 and 8,709,476.70 is: 13,064,215.05
Step by Step Solution
- Step 1: Write the proportion equation
12,128,413.80 : 18,192,620.70 = 8,709,476.70 : x - Step 2: Convert to fraction form
12,128,413.80/18,192,620.70 = 8,709,476.70/x - Step 3: Cross multiply
12,128,413.80x = 18,192,620.70 × 8,709,476.70 - Step 4: Simplify right side
12,128,413.80x = 158,448,206,098,587.66 - Step 5: Solve for x
x = 158,448,206,098,587.66/12,128,413.80 - Step 6: Final answer
x = 13,064,215.05
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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.