Finding the Fourth Proportional to 100,938.86, 139,298.43 and 57,921.99
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Solution
The fourth proportional to 100,938.86, 139,298.43 and 57,921.99 is: 79,933.95
Step by Step Solution
- Step 1: Write the proportion equation
100,938.86 : 139,298.43 = 57,921.99 : x - Step 2: Convert to fraction form
100,938.86/139,298.43 = 57,921.99/x - Step 3: Cross multiply
100,938.86x = 139,298.43 × 57,921.99 - Step 4: Simplify right side
100,938.86x = 8,068,441,964.31 - Step 5: Solve for x
x = 8,068,441,964.31/100,938.86 - Step 6: Final answer
x = 79,933.95
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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.