Finding the Fourth Proportional to 81,551,201.80, 122,326,802.70 and 78,415,918.60
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Solution
The fourth proportional to 81,551,201.80, 122,326,802.70 and 78,415,918.60 is: 117,623,877.90
Step by Step Solution
- Step 1: Write the proportion equation
81,551,201.80 : 122,326,802.70 = 78,415,918.60 : x - Step 2: Convert to fraction form
81,551,201.80/122,326,802.70 = 78,415,918.60/x - Step 3: Cross multiply
81,551,201.80x = 122,326,802.70 × 78,415,918.60 - Step 4: Simplify right side
81,551,201.80x = 9,592,368,603,121,460 - Step 5: Solve for x
x = 9,592,368,603,121,460/81,551,201.80 - Step 6: Final answer
x = 117,623,877.90
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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.