Finding the Fourth Proportional to 221,159,729.32, 305,261,125.15 and 128,370,130.72
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Solution
The fourth proportional to 221,159,729.32, 305,261,125.15 and 128,370,130.72 is: 177,186,012.39
Step by Step Solution
- Step 1: Write the proportion equation
221,159,729.32 : 305,261,125.15 = 128,370,130.72 : x - Step 2: Convert to fraction form
221,159,729.32/305,261,125.15 = 128,370,130.72/x - Step 3: Cross multiply
221,159,729.32x = 305,261,125.15 × 128,370,130.72 - Step 4: Simplify right side
221,159,729.32x = 39,186,410,539,239,776 - Step 5: Solve for x
x = 39,186,410,539,239,776/221,159,729.32 - Step 6: Final answer
x = 177,186,012.39
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.