Finding the Fourth Proportional to 128,985.80, 193,478.70 and 113,433.80
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Solution
The fourth proportional to 128,985.80, 193,478.70 and 113,433.80 is: 170,150.70
Step by Step Solution
- Step 1: Write the proportion equation
128,985.80 : 193,478.70 = 113,433.80 : x - Step 2: Convert to fraction form
128,985.80/193,478.70 = 113,433.80/x - Step 3: Cross multiply
128,985.80x = 193,478.70 × 113,433.80 - Step 4: Simplify right side
128,985.80x = 21,947,024,160.06 - Step 5: Solve for x
x = 21,947,024,160.06/128,985.80 - Step 6: Final answer
x = 170,150.70
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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.