Finding the Fourth Proportional to 138,920.08, 191,691.38 and 87,842.70
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Solution
The fourth proportional to 138,920.08, 191,691.38 and 87,842.70 is: 121,211.34
Step by Step Solution
- Step 1: Write the proportion equation
138,920.08 : 191,691.38 = 87,842.70 : x - Step 2: Convert to fraction form
138,920.08/191,691.38 = 87,842.70/x - Step 3: Cross multiply
138,920.08x = 191,691.38 × 87,842.70 - Step 4: Simplify right side
138,920.08x = 16,838,688,385.93 - Step 5: Solve for x
x = 16,838,688,385.93/138,920.08 - Step 6: Final answer
x = 121,211.34
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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.