Finding the Fourth Proportional to 85,778.80, 128,809.68 and 57,878.08
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Solution
The fourth proportional to 85,778.80, 128,809.68 and 57,878.08 is: 86,912.58
Step by Step Solution
- Step 1: Write the proportion equation
85,778.80 : 128,809.68 = 57,878.08 : x - Step 2: Convert to fraction form
85,778.80/128,809.68 = 57,878.08/x - Step 3: Cross multiply
85,778.80x = 128,809.68 × 57,878.08 - Step 4: Simplify right side
85,778.80x = 7,455,256,963.81 - Step 5: Solve for x
x = 7,455,256,963.81/85,778.80 - Step 6: Final answer
x = 86,912.58
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1.5x scale
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.