Finding the Fourth Proportional to 128,979.12, 177,987.63 and 77,325.42
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Solution
The fourth proportional to 128,979.12, 177,987.63 and 77,325.42 is: 106,706.95
Step by Step Solution
- Step 1: Write the proportion equation
128,979.12 : 177,987.63 = 77,325.42 : x - Step 2: Convert to fraction form
128,979.12/177,987.63 = 77,325.42/x - Step 3: Cross multiply
128,979.12x = 177,987.63 × 77,325.42 - Step 4: Simplify right side
128,979.12x = 13,762,968,244.55 - Step 5: Solve for x
x = 13,762,968,244.55/128,979.12 - Step 6: Final answer
x = 106,706.95
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1.5x scale
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.