Finding the Fourth Proportional to 86,495.20, 129,742.80 and 47,129.20
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Solution
The fourth proportional to 86,495.20, 129,742.80 and 47,129.20 is: 70,693.80
Step by Step Solution
- Step 1: Write the proportion equation
86,495.20 : 129,742.80 = 47,129.20 : x - Step 2: Convert to fraction form
86,495.20/129,742.80 = 47,129.20/x - Step 3: Cross multiply
86,495.20x = 129,742.80 × 47,129.20 - Step 4: Simplify right side
86,495.20x = 6,114,674,369.76 - Step 5: Solve for x
x = 6,114,674,369.76/86,495.20 - Step 6: Final answer
x = 70,693.80
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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.