Finding the Fourth Proportional to 128,435.75, 177,276.95 and 74,731.14
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Solution
The fourth proportional to 128,435.75, 177,276.95 and 74,731.14 is: 103,149.70
Step by Step Solution
- Step 1: Write the proportion equation
128,435.75 : 177,276.95 = 74,731.14 : x - Step 2: Convert to fraction form
128,435.75/177,276.95 = 74,731.14/x - Step 3: Cross multiply
128,435.75x = 177,276.95 × 74,731.14 - Step 4: Simplify right side
128,435.75x = 13,248,108,195.57 - Step 5: Solve for x
x = 13,248,108,195.57/128,435.75 - Step 6: Final answer
x = 103,149.70
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.