Finding the Fourth Proportional to 86,616.08, 129,670.68 and 78,315.20
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Solution
The fourth proportional to 86,616.08, 129,670.68 and 78,315.20 is: 117,243.65
Step by Step Solution
- Step 1: Write the proportion equation
86,616.08 : 129,670.68 = 78,315.20 : x - Step 2: Convert to fraction form
86,616.08/129,670.68 = 78,315.20/x - Step 3: Cross multiply
86,616.08x = 129,670.68 × 78,315.20 - Step 4: Simplify right side
86,616.08x = 10,155,185,238.34 - Step 5: Solve for x
x = 10,155,185,238.34/86,616.08 - Step 6: Final answer
x = 117,243.65
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.