Finding the Fourth Proportional to 138,307.70, 207,461.55 and 85,819.70
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Solution
The fourth proportional to 138,307.70, 207,461.55 and 85,819.70 is: 128,729.55
Step by Step Solution
- Step 1: Write the proportion equation
138,307.70 : 207,461.55 = 85,819.70 : x - Step 2: Convert to fraction form
138,307.70/207,461.55 = 85,819.70/x - Step 3: Cross multiply
138,307.70x = 207,461.55 × 85,819.70 - Step 4: Simplify right side
138,307.70x = 17,804,287,982.54 - Step 5: Solve for x
x = 17,804,287,982.54/138,307.70 - Step 6: Final answer
x = 128,729.55
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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.