Finding the Fourth Proportional to 128,723,440.80, 177,612,934.80 and 72,210,064.80
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Solution
The fourth proportional to 128,723,440.80, 177,612,934.80 and 72,210,064.80 is: 99,635,633.20
Step by Step Solution
- Step 1: Write the proportion equation
128,723,440.80 : 177,612,934.80 = 72,210,064.80 : x - Step 2: Convert to fraction form
128,723,440.80/177,612,934.80 = 72,210,064.80/x - Step 3: Cross multiply
128,723,440.80x = 177,612,934.80 × 72,210,064.80 - Step 4: Simplify right side
128,723,440.80x = 12,825,441,531,226,176 - Step 5: Solve for x
x = 12,825,441,531,226,176/128,723,440.80 - Step 6: Final answer
x = 99,635,633.20
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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.