Finding the Fourth Proportional to 128,779.35, 177,720.12 and 75,055.70
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Solution
The fourth proportional to 128,779.35, 177,720.12 and 75,055.70 is: 103,579.55
Step by Step Solution
- Step 1: Write the proportion equation
128,779.35 : 177,720.12 = 75,055.70 : x - Step 2: Convert to fraction form
128,779.35/177,720.12 = 75,055.70/x - Step 3: Cross multiply
128,779.35x = 177,720.12 × 75,055.70 - Step 4: Simplify right side
128,779.35x = 13,338,907,122.08 - Step 5: Solve for x
x = 13,338,907,122.08/128,779.35 - Step 6: Final answer
x = 103,579.55
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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.