Finding the Fourth Proportional to 138,341.28, 190,917.36 and 77,931.12
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Solution
The fourth proportional to 138,341.28, 190,917.36 and 77,931.12 is: 107,548.55
Step by Step Solution
- Step 1: Write the proportion equation
138,341.28 : 190,917.36 = 77,931.12 : x - Step 2: Convert to fraction form
138,341.28/190,917.36 = 77,931.12/x - Step 3: Cross multiply
138,341.28x = 190,917.36 × 77,931.12 - Step 4: Simplify right side
138,341.28x = 14,878,403,692.24 - Step 5: Solve for x
x = 14,878,403,692.24/138,341.28 - Step 6: Final answer
x = 107,548.55
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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.