Finding the Fourth Proportional to 115,307.70, 172,961.55 and 91,979.70
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Solution
The fourth proportional to 115,307.70, 172,961.55 and 91,979.70 is: 137,969.55
Step by Step Solution
- Step 1: Write the proportion equation
115,307.70 : 172,961.55 = 91,979.70 : x - Step 2: Convert to fraction form
115,307.70/172,961.55 = 91,979.70/x - Step 3: Cross multiply
115,307.70x = 172,961.55 × 91,979.70 - Step 4: Simplify right side
115,307.70x = 15,908,951,480.54 - Step 5: Solve for x
x = 15,908,951,480.54/115,307.70 - Step 6: Final answer
x = 137,969.55
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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.