Finding the Fourth Proportional to 128,909.20, 193,363.80 and 86,918.80
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Solution
The fourth proportional to 128,909.20, 193,363.80 and 86,918.80 is: 130,378.20
Step by Step Solution
- Step 1: Write the proportion equation
128,909.20 : 193,363.80 = 86,918.80 : x - Step 2: Convert to fraction form
128,909.20/193,363.80 = 86,918.80/x - Step 3: Cross multiply
128,909.20x = 193,363.80 × 86,918.80 - Step 4: Simplify right side
128,909.20x = 16,806,949,459.44 - Step 5: Solve for x
x = 16,806,949,459.44/128,909.20 - Step 6: Final answer
x = 130,378.20
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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.