Finding the Fourth Proportional to 135,421.30, 186,879.08 and 74,990.64
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Solution
The fourth proportional to 135,421.30, 186,879.08 and 74,990.64 is: 103,485.81
Step by Step Solution
- Step 1: Write the proportion equation
135,421.30 : 186,879.08 = 74,990.64 : x - Step 2: Convert to fraction form
135,421.30/186,879.08 = 74,990.64/x - Step 3: Cross multiply
135,421.30x = 186,879.08 × 74,990.64 - Step 4: Simplify right side
135,421.30x = 14,014,181,999.29 - Step 5: Solve for x
x = 14,014,181,999.29/135,421.30 - Step 6: Final answer
x = 103,485.81
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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.