Finding the Fourth Proportional to 128,888.42, 177,874.18 and 72,303.44
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Solution
The fourth proportional to 128,888.42, 177,874.18 and 72,303.44 is: 99,783.32
Step by Step Solution
- Step 1: Write the proportion equation
128,888.42 : 177,874.18 = 72,303.44 : x - Step 2: Convert to fraction form
128,888.42/177,874.18 = 72,303.44/x - Step 3: Cross multiply
128,888.42x = 177,874.18 × 72,303.44 - Step 4: Simplify right side
128,888.42x = 12,860,914,031.05 - Step 5: Solve for x
x = 12,860,914,031.05/128,888.42 - Step 6: Final answer
x = 99,783.32
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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.