Finding the Fourth Proportional to 128,629.36, 192,962.72 and 39,890.02
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Solution
The fourth proportional to 128,629.36, 192,962.72 and 39,890.02 is: 59,840.82
Step by Step Solution
- Step 1: Write the proportion equation
128,629.36 : 192,962.72 = 39,890.02 : x - Step 2: Convert to fraction form
128,629.36/192,962.72 = 39,890.02/x - Step 3: Cross multiply
128,629.36x = 192,962.72 × 39,890.02 - Step 4: Simplify right side
128,629.36x = 7,697,286,560.60 - Step 5: Solve for x
x = 7,697,286,560.60/128,629.36 - Step 6: Final answer
x = 59,840.82
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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.