Finding the Fourth Proportional to 128,979.36, 178,051.98 and 86,030.70
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Solution
The fourth proportional to 128,979.36, 178,051.98 and 86,030.70 is: 118,762.70
Step by Step Solution
- Step 1: Write the proportion equation
128,979.36 : 178,051.98 = 86,030.70 : x - Step 2: Convert to fraction form
128,979.36/178,051.98 = 86,030.70/x - Step 3: Cross multiply
128,979.36x = 178,051.98 × 86,030.70 - Step 4: Simplify right side
128,979.36x = 15,317,936,475.79 - Step 5: Solve for x
x = 15,317,936,475.79/128,979.36 - Step 6: Final answer
x = 118,762.70
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.