Finding the Fourth Proportional to 100,678.97, 138,937.08 and 55,357.71
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Solution
The fourth proportional to 100,678.97, 138,937.08 and 55,357.71 is: 76,393.70
Step by Step Solution
- Step 1: Write the proportion equation
100,678.97 : 138,937.08 = 55,357.71 : x - Step 2: Convert to fraction form
100,678.97/138,937.08 = 55,357.71/x - Step 3: Cross multiply
100,678.97x = 138,937.08 × 55,357.71 - Step 4: Simplify right side
100,678.97x = 7,691,238,582.89 - Step 5: Solve for x
x = 7,691,238,582.89/100,678.97 - Step 6: Final answer
x = 76,393.70
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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.