Finding the Fourth Proportional to 7,920.40, 11,878.98 and 2,726.68
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Solution
The fourth proportional to 7,920.40, 11,878.98 and 2,726.68 is: 4,089.46
Step by Step Solution
- Step 1: Write the proportion equation
7,920.40 : 11,878.98 = 2,726.68 : x - Step 2: Convert to fraction form
7,920.40/11,878.98 = 2,726.68/x - Step 3: Cross multiply
7,920.40x = 11,878.98 × 2,726.68 - Step 4: Simplify right side
7,920.40x = 32,390,177.19 - Step 5: Solve for x
x = 32,390,177.19/7,920.40 - Step 6: Final answer
x = 4,089.46
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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.