Finding the Fourth Proportional to 135,128.08, 186,486.12 and 78,557.20
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Solution
The fourth proportional to 135,128.08, 186,486.12 and 78,557.20 is: 108,414.38
Step by Step Solution
- Step 1: Write the proportion equation
135,128.08 : 186,486.12 = 78,557.20 : x - Step 2: Convert to fraction form
135,128.08/186,486.12 = 78,557.20/x - Step 3: Cross multiply
135,128.08x = 186,486.12 × 78,557.20 - Step 4: Simplify right side
135,128.08x = 14,649,827,426.06 - Step 5: Solve for x
x = 14,649,827,426.06/135,128.08 - Step 6: Final answer
x = 108,414.38
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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.