Finding the Fourth Proportional to 128,451.51, 177,263.28 and 71,862.93
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Solution
The fourth proportional to 128,451.51, 177,263.28 and 71,862.93 is: 99,170.95
Step by Step Solution
- Step 1: Write the proportion equation
128,451.51 : 177,263.28 = 71,862.93 : x - Step 2: Convert to fraction form
128,451.51/177,263.28 = 71,862.93/x - Step 3: Cross multiply
128,451.51x = 177,263.28 × 71,862.93 - Step 4: Simplify right side
128,451.51x = 12,738,658,682.21 - Step 5: Solve for x
x = 12,738,658,682.21/128,451.51 - Step 6: Final answer
x = 99,170.95
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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.