Finding the Fourth Proportional to 128,721,864.80, 193,092,128.40 and 77,493,576.80
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Solution
The fourth proportional to 128,721,864.80, 193,092,128.40 and 77,493,576.80 is: 116,245,982.80
Step by Step Solution
- Step 1: Write the proportion equation
128,721,864.80 : 193,092,128.40 = 77,493,576.80 : x - Step 2: Convert to fraction form
128,721,864.80/193,092,128.40 = 77,493,576.80/x - Step 3: Cross multiply
128,721,864.80x = 193,092,128.40 × 77,493,576.80 - Step 4: Simplify right side
128,721,864.80x = 14,963,399,681,640,862 - Step 5: Solve for x
x = 14,963,399,681,640,862/128,721,864.80 - Step 6: Final answer
x = 116,245,982.80
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.