Finding the Fourth Proportional to 138,139.08, 207,208.58 and 91,381.02
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Solution
The fourth proportional to 138,139.08, 207,208.58 and 91,381.02 is: 137,071.50
Step by Step Solution
- Step 1: Write the proportion equation
138,139.08 : 207,208.58 = 91,381.02 : x - Step 2: Convert to fraction form
138,139.08/207,208.58 = 91,381.02/x - Step 3: Cross multiply
138,139.08x = 207,208.58 × 91,381.02 - Step 4: Simplify right side
138,139.08x = 18,934,931,393.15 - Step 5: Solve for x
x = 18,934,931,393.15/138,139.08 - Step 6: Final answer
x = 137,071.50
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1.5x scale
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.