Finding the Fourth Proportional to 128,342.79, 177,134.94 and 74,658.96
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Solution
The fourth proportional to 128,342.79, 177,134.94 and 74,658.96 is: 103,042.10
Step by Step Solution
- Step 1: Write the proportion equation
128,342.79 : 177,134.94 = 74,658.96 : x - Step 2: Convert to fraction form
128,342.79/177,134.94 = 74,658.96/x - Step 3: Cross multiply
128,342.79x = 177,134.94 × 74,658.96 - Step 4: Simplify right side
128,342.79x = 13,224,710,400.06 - Step 5: Solve for x
x = 13,224,710,400.06/128,342.79 - Step 6: Final answer
x = 103,042.10
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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.