Finding the Fourth Proportional to 128,783,431.32, 177,705,004.44 and 87,058,282.06
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Solution
The fourth proportional to 128,783,431.32, 177,705,004.44 and 87,058,282.06 is: 120,129,524.75
Step by Step Solution
- Step 1: Write the proportion equation
128,783,431.32 : 177,705,004.44 = 87,058,282.06 : x - Step 2: Convert to fraction form
128,783,431.32/177,705,004.44 = 87,058,282.06/x - Step 3: Cross multiply
128,783,431.32x = 177,705,004.44 × 87,058,282.06 - Step 4: Simplify right side
128,783,431.32x = 15,470,692,400,011,072 - Step 5: Solve for x
x = 15,470,692,400,011,072/128,783,431.32 - Step 6: Final answer
x = 120,129,524.75
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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.