Finding the Fourth Proportional to 138,309.70, 207,464.55 and 85,821.70
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Solution
The fourth proportional to 138,309.70, 207,464.55 and 85,821.70 is: 128,732.55
Step by Step Solution
- Step 1: Write the proportion equation
138,309.70 : 207,464.55 = 85,821.70 : x - Step 2: Convert to fraction form
138,309.70/207,464.55 = 85,821.70/x - Step 3: Cross multiply
138,309.70x = 207,464.55 × 85,821.70 - Step 4: Simplify right side
138,309.70x = 17,804,960,370.74 - Step 5: Solve for x
x = 17,804,960,370.74/138,309.70 - Step 6: Final answer
x = 128,732.55
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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.