Finding the Fourth Proportional to 81,190,750.78, 121,890,053.18 and 69,749,416.54
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Solution
The fourth proportional to 81,190,750.78, 121,890,053.18 and 69,749,416.54 is: 104,713,406.51
Step by Step Solution
- Step 1: Write the proportion equation
81,190,750.78 : 121,890,053.18 = 69,749,416.54 : x - Step 2: Convert to fraction form
81,190,750.78/121,890,053.18 = 69,749,416.54/x - Step 3: Cross multiply
81,190,750.78x = 121,890,053.18 × 69,749,416.54 - Step 4: Simplify right side
81,190,750.78x = 8,501,760,091,334,573 - Step 5: Solve for x
x = 8,501,760,091,334,573/81,190,750.78 - Step 6: Final answer
x = 104,713,406.51
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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.