Finding the Fourth Proportional to 138,221.68, 190,746.20 and 78,605.68
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Solution
The fourth proportional to 138,221.68, 190,746.20 and 78,605.68 is: 108,476.00
Step by Step Solution
- Step 1: Write the proportion equation
138,221.68 : 190,746.20 = 78,605.68 : x - Step 2: Convert to fraction form
138,221.68/190,746.20 = 78,605.68/x - Step 3: Cross multiply
138,221.68x = 190,746.20 × 78,605.68 - Step 4: Simplify right side
138,221.68x = 14,993,734,758.42 - Step 5: Solve for x
x = 14,993,734,758.42/138,221.68 - Step 6: Final answer
x = 108,476.00
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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.