Finding the Fourth Proportional to 77,678.28, 107,129.88 and 65,637.60
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Solution
The fourth proportional to 77,678.28, 107,129.88 and 65,637.60 is: 90,523.99
Step by Step Solution
- Step 1: Write the proportion equation
77,678.28 : 107,129.88 = 65,637.60 : x - Step 2: Convert to fraction form
77,678.28/107,129.88 = 65,637.60/x - Step 3: Cross multiply
77,678.28x = 107,129.88 × 65,637.60 - Step 4: Simplify right side
77,678.28x = 7,031,748,211.49 - Step 5: Solve for x
x = 7,031,748,211.49/77,678.28 - Step 6: Final answer
x = 90,523.99
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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.