Finding the Fourth Proportional to 85.64, 128.61 and 59.99
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Solution
The fourth proportional to 85.64, 128.61 and 59.99 is: 90.09
Step by Step Solution
- Step 1: Write the proportion equation
85.64 : 128.61 = 59.99 : x - Step 2: Convert to fraction form
85.64/128.61 = 59.99/x - Step 3: Cross multiply
85.64x = 128.61 × 59.99 - Step 4: Simplify right side
85.64x = 7,714.67 - Step 5: Solve for x
x = 7,714.67/85.64 - Step 6: Final answer
x = 90.09
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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.