Finding the Fourth Proportional to 259.86, 389.99 and 138.18
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Solution
The fourth proportional to 259.86, 389.99 and 138.18 is: 207.37
Step by Step Solution
- Step 1: Write the proportion equation
259.86 : 389.99 = 138.18 : x - Step 2: Convert to fraction form
259.86/389.99 = 138.18/x - Step 3: Cross multiply
259.86x = 389.99 × 138.18 - Step 4: Simplify right side
259.86x = 53,888.13 - Step 5: Solve for x
x = 53,888.13/259.86 - Step 6: Final answer
x = 207.37
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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.