Finding the Fourth Proportional to 81,985.20, 122,977.80 and 72,799.80
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Solution
The fourth proportional to 81,985.20, 122,977.80 and 72,799.80 is: 109,199.70
Step by Step Solution
- Step 1: Write the proportion equation
81,985.20 : 122,977.80 = 72,799.80 : x - Step 2: Convert to fraction form
81,985.20/122,977.80 = 72,799.80/x - Step 3: Cross multiply
81,985.20x = 122,977.80 × 72,799.80 - Step 4: Simplify right side
81,985.20x = 8,952,759,244.44 - Step 5: Solve for x
x = 8,952,759,244.44/81,985.20 - Step 6: Final answer
x = 109,199.70
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Double scale
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Similar ratio
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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.