Finding the Fourth Proportional to 85,965,310.80, 128,947,966.20 and 78,029,125.20
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Solution
The fourth proportional to 85,965,310.80, 128,947,966.20 and 78,029,125.20 is: 117,043,687.80
Step by Step Solution
- Step 1: Write the proportion equation
85,965,310.80 : 128,947,966.20 = 78,029,125.20 : x - Step 2: Convert to fraction form
85,965,310.80/128,947,966.20 = 78,029,125.20/x - Step 3: Cross multiply
85,965,310.80x = 128,947,966.20 × 78,029,125.20 - Step 4: Simplify right side
85,965,310.80x = 10,061,696,998,905,168 - Step 5: Solve for x
x = 10,061,696,998,905,168/85,965,310.80 - Step 6: Final answer
x = 117,043,687.80
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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.