Finding the Fourth Proportional to 138,398.18, 190,988.57 and 77,988.29
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Solution
The fourth proportional to 138,398.18, 190,988.57 and 77,988.29 is: 107,623.32
Step by Step Solution
- Step 1: Write the proportion equation
138,398.18 : 190,988.57 = 77,988.29 : x - Step 2: Convert to fraction form
138,398.18/190,988.57 = 77,988.29/x - Step 3: Cross multiply
138,398.18x = 190,988.57 × 77,988.29 - Step 4: Simplify right side
138,398.18x = 14,894,871,223.87 - Step 5: Solve for x
x = 14,894,871,223.87/138,398.18 - Step 6: Final answer
x = 107,623.32
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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.