Finding the Fourth Proportional to 412.91, 619.45 and 138.99
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Solution
The fourth proportional to 412.91, 619.45 and 138.99 is: 208.52
Step by Step Solution
- Step 1: Write the proportion equation
412.91 : 619.45 = 138.99 : x - Step 2: Convert to fraction form
412.91/619.45 = 138.99/x - Step 3: Cross multiply
412.91x = 619.45 × 138.99 - Step 4: Simplify right side
412.91x = 86,097.01 - Step 5: Solve for x
x = 86,097.01/412.91 - Step 6: Final answer
x = 208.52
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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.