Finding the Fourth Proportional to 128,578,062.11, 177,452,445.47 and 72,078,068.10
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Solution
The fourth proportional to 128,578,062.11, 177,452,445.47 and 72,078,068.10 is: 99,475,985.56
Step by Step Solution
- Step 1: Write the proportion equation
128,578,062.11 : 177,452,445.47 = 72,078,068.10 : x - Step 2: Convert to fraction form
128,578,062.11/177,452,445.47 = 72,078,068.10/x - Step 3: Cross multiply
128,578,062.11x = 177,452,445.47 × 72,078,068.10 - Step 4: Simplify right side
128,578,062.11x = 12,790,429,448,737,806 - Step 5: Solve for x
x = 12,790,429,448,737,806/128,578,062.11 - Step 6: Final answer
x = 99,475,985.56
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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.