Finding the Fourth Proportional to 78,138.14, 117,206.99 and 18,973.81
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Solution
The fourth proportional to 78,138.14, 117,206.99 and 18,973.81 is: 28,460.66
Step by Step Solution
- Step 1: Write the proportion equation
78,138.14 : 117,206.99 = 18,973.81 : x - Step 2: Convert to fraction form
78,138.14/117,206.99 = 18,973.81/x - Step 3: Cross multiply
78,138.14x = 117,206.99 × 18,973.81 - Step 4: Simplify right side
78,138.14x = 2,223,863,158.93 - Step 5: Solve for x
x = 2,223,863,158.93/78,138.14 - Step 6: Final answer
x = 28,460.66
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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.