Finding the Fourth Proportional to 81,135.80, 121,703.70 and 46,143.80
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Solution
The fourth proportional to 81,135.80, 121,703.70 and 46,143.80 is: 69,215.70
Step by Step Solution
- Step 1: Write the proportion equation
81,135.80 : 121,703.70 = 46,143.80 : x - Step 2: Convert to fraction form
81,135.80/121,703.70 = 46,143.80/x - Step 3: Cross multiply
81,135.80x = 121,703.70 × 46,143.80 - Step 4: Simplify right side
81,135.80x = 5,615,871,192.06 - Step 5: Solve for x
x = 5,615,871,192.06/81,135.80 - Step 6: Final answer
x = 69,215.70
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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.