Finding the Fourth Proportional to 128,619.56, 177,395.94 and 77,579.08
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Solution
The fourth proportional to 128,619.56, 177,395.94 and 77,579.08 is: 106,999.39
Step by Step Solution
- Step 1: Write the proportion equation
128,619.56 : 177,395.94 = 77,579.08 : x - Step 2: Convert to fraction form
128,619.56/177,395.94 = 77,579.08/x - Step 3: Cross multiply
128,619.56x = 177,395.94 × 77,579.08 - Step 4: Simplify right side
128,619.56x = 13,762,213,820.94 - Step 5: Solve for x
x = 13,762,213,820.94/128,619.56 - Step 6: Final answer
x = 106,999.39
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1.5x scale
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.