Finding the Fourth Proportional to 128,412.10, 192,638.67 and 39,644.74
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Solution
The fourth proportional to 128,412.10, 192,638.67 and 39,644.74 is: 59,473.45
Step by Step Solution
- Step 1: Write the proportion equation
128,412.10 : 192,638.67 = 39,644.74 : x - Step 2: Convert to fraction form
128,412.10/192,638.67 = 39,644.74/x - Step 3: Cross multiply
128,412.10x = 192,638.67 × 39,644.74 - Step 4: Simplify right side
128,412.10x = 7,637,109,986.10 - Step 5: Solve for x
x = 7,637,109,986.10/128,412.10 - Step 6: Final answer
x = 59,473.45
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1.5x scale
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.