Finding the Fourth Proportional to 85,571,982.80, 128,357,974.20 and 81,391,605.20
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Solution
The fourth proportional to 85,571,982.80, 128,357,974.20 and 81,391,605.20 is: 122,087,407.80
Step by Step Solution
- Step 1: Write the proportion equation
85,571,982.80 : 128,357,974.20 = 81,391,605.20 : x - Step 2: Convert to fraction form
85,571,982.80/128,357,974.20 = 81,391,605.20/x - Step 3: Cross multiply
85,571,982.80x = 128,357,974.20 × 81,391,605.20 - Step 4: Simplify right side
85,571,982.80x = 10,447,261,560,358,186 - Step 5: Solve for x
x = 10,447,261,560,358,186/85,571,982.80 - Step 6: Final answer
x = 122,087,407.80
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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.