Finding the Fourth Proportional to 128,122.20, 176,774.94 and 77,811.48
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Solution
The fourth proportional to 128,122.20, 176,774.94 and 77,811.48 is: 107,359.38
Step by Step Solution
- Step 1: Write the proportion equation
128,122.20 : 176,774.94 = 77,811.48 : x - Step 2: Convert to fraction form
128,122.20/176,774.94 = 77,811.48/x - Step 3: Cross multiply
128,122.20x = 176,774.94 × 77,811.48 - Step 4: Simplify right side
128,122.20x = 13,755,119,708.31 - Step 5: Solve for x
x = 13,755,119,708.31/128,122.20 - Step 6: Final answer
x = 107,359.38
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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.