Finding the Fourth Proportional to 81,490.20, 122,235.30 and 78,209.70
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Solution
The fourth proportional to 81,490.20, 122,235.30 and 78,209.70 is: 117,314.55
Step by Step Solution
- Step 1: Write the proportion equation
81,490.20 : 122,235.30 = 78,209.70 : x - Step 2: Convert to fraction form
81,490.20/122,235.30 = 78,209.70/x - Step 3: Cross multiply
81,490.20x = 122,235.30 × 78,209.70 - Step 4: Simplify right side
81,490.20x = 9,559,986,142.41 - Step 5: Solve for x
x = 9,559,986,142.41/81,490.20 - Step 6: Final answer
x = 117,314.55
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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.