Finding the Fourth Proportional to 81,135.20, 121,702.80 and 78,024.80
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Solution
The fourth proportional to 81,135.20, 121,702.80 and 78,024.80 is: 117,037.20
Step by Step Solution
- Step 1: Write the proportion equation
81,135.20 : 121,702.80 = 78,024.80 : x - Step 2: Convert to fraction form
81,135.20/121,702.80 = 78,024.80/x - Step 3: Cross multiply
81,135.20x = 121,702.80 × 78,024.80 - Step 4: Simplify right side
81,135.20x = 9,495,836,629.44 - Step 5: Solve for x
x = 9,495,836,629.44/81,135.20 - Step 6: Final answer
x = 117,037.20
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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.