Finding the Fourth Proportional to 121,612.64, 167,777.12 and 81,262.49
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Solution
The fourth proportional to 121,612.64, 167,777.12 and 81,262.49 is: 112,109.95
Step by Step Solution
- Step 1: Write the proportion equation
121,612.64 : 167,777.12 = 81,262.49 : x - Step 2: Convert to fraction form
121,612.64/167,777.12 = 81,262.49/x - Step 3: Cross multiply
121,612.64x = 167,777.12 × 81,262.49 - Step 4: Simplify right side
121,612.64x = 13,633,986,844.25 - Step 5: Solve for x
x = 13,633,986,844.25/121,612.64 - Step 6: Final answer
x = 112,109.95
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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.