Finding the Fourth Proportional to 221,730.18, 305,987.13 and 121,128.90
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Solution
The fourth proportional to 221,730.18, 305,987.13 and 121,128.90 is: 167,157.60
Step by Step Solution
- Step 1: Write the proportion equation
221,730.18 : 305,987.13 = 121,128.90 : x - Step 2: Convert to fraction form
221,730.18/305,987.13 = 121,128.90/x - Step 3: Cross multiply
221,730.18x = 305,987.13 × 121,128.90 - Step 4: Simplify right side
221,730.18x = 37,063,884,471.06 - Step 5: Solve for x
x = 37,063,884,471.06/221,730.18 - Step 6: Final answer
x = 167,157.60
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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.