Finding the Fourth Proportional to 86,009.68, 128,878.44 and 66,336.40
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Solution
The fourth proportional to 86,009.68, 128,878.44 and 66,336.40 is: 99,399.65
Step by Step Solution
- Step 1: Write the proportion equation
86,009.68 : 128,878.44 = 66,336.40 : x - Step 2: Convert to fraction form
86,009.68/128,878.44 = 66,336.40/x - Step 3: Cross multiply
86,009.68x = 128,878.44 × 66,336.40 - Step 4: Simplify right side
86,009.68x = 8,549,331,747.22 - Step 5: Solve for x
x = 8,549,331,747.22/86,009.68 - Step 6: Final answer
x = 99,399.65
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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.