Finding the Fourth Proportional to 76,871.80, 115,307.70 and 61,319.80
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Solution
The fourth proportional to 76,871.80, 115,307.70 and 61,319.80 is: 91,979.70
Step by Step Solution
- Step 1: Write the proportion equation
76,871.80 : 115,307.70 = 61,319.80 : x - Step 2: Convert to fraction form
76,871.80/115,307.70 = 61,319.80/x - Step 3: Cross multiply
76,871.80x = 115,307.70 × 61,319.80 - Step 4: Simplify right side
76,871.80x = 7,070,645,102.46 - Step 5: Solve for x
x = 7,070,645,102.46/76,871.80 - Step 6: Final answer
x = 91,979.70
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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.