Finding the Fourth Proportional to 128,907,728.55, 177,896,957.04 and 72,402,416.37
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Solution
The fourth proportional to 128,907,728.55, 177,896,957.04 and 72,402,416.37 is: 99,917,745.04
Step by Step Solution
- Step 1: Write the proportion equation
128,907,728.55 : 177,896,957.04 = 72,402,416.37 : x - Step 2: Convert to fraction form
128,907,728.55/177,896,957.04 = 72,402,416.37/x - Step 3: Cross multiply
128,907,728.55x = 177,896,957.04 × 72,402,416.37 - Step 4: Simplify right side
128,907,728.55x = 12,880,169,554,566,082 - Step 5: Solve for x
x = 12,880,169,554,566,082/128,907,728.55 - Step 6: Final answer
x = 99,917,745.04
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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.