Finding the Fourth Proportional to 139,860.99, 209,769.71 and 76,712.18
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Solution
The fourth proportional to 139,860.99, 209,769.71 and 76,712.18 is: 115,056.32
Step by Step Solution
- Step 1: Write the proportion equation
139,860.99 : 209,769.71 = 76,712.18 : x - Step 2: Convert to fraction form
139,860.99/209,769.71 = 76,712.18/x - Step 3: Cross multiply
139,860.99x = 209,769.71 × 76,712.18 - Step 4: Simplify right side
139,860.99x = 16,091,890,319.66 - Step 5: Solve for x
x = 16,091,890,319.66/139,860.99 - Step 6: Final answer
x = 115,056.32
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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.