Finding the Fourth Proportional to 138,603.40, 207,905.10 and 85,841.80
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Solution
The fourth proportional to 138,603.40, 207,905.10 and 85,841.80 is: 128,762.70
Step by Step Solution
- Step 1: Write the proportion equation
138,603.40 : 207,905.10 = 85,841.80 : x - Step 2: Convert to fraction form
138,603.40/207,905.10 = 85,841.80/x - Step 3: Cross multiply
138,603.40x = 207,905.10 × 85,841.80 - Step 4: Simplify right side
138,603.40x = 17,846,948,013.18 - Step 5: Solve for x
x = 17,846,948,013.18/138,603.40 - Step 6: Final answer
x = 128,762.70
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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.