Finding the Fourth Proportional to 85,865.80, 128,798.70 and 39,209.80
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Solution
The fourth proportional to 85,865.80, 128,798.70 and 39,209.80 is: 58,814.70
Step by Step Solution
- Step 1: Write the proportion equation
85,865.80 : 128,798.70 = 39,209.80 : x - Step 2: Convert to fraction form
85,865.80/128,798.70 = 39,209.80/x - Step 3: Cross multiply
85,865.80x = 128,798.70 × 39,209.80 - Step 4: Simplify right side
85,865.80x = 5,050,171,267.26 - Step 5: Solve for x
x = 5,050,171,267.26/85,865.80 - Step 6: Final answer
x = 58,814.70
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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.