Finding the Fourth Proportional to 1,315.99, 1,973.99 and 342.09
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Solution
The fourth proportional to 1,315.99, 1,973.99 and 342.09 is: 513.14
Step by Step Solution
- Step 1: Write the proportion equation
1,315.99 : 1,973.99 = 342.09 : x - Step 2: Convert to fraction form
1,315.99/1,973.99 = 342.09/x - Step 3: Cross multiply
1,315.99x = 1,973.99 × 342.09 - Step 4: Simplify right side
1,315.99x = 675,289.21 - Step 5: Solve for x
x = 675,289.21/1,315.99 - Step 6: Final answer
x = 513.14
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Double scale
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Similar ratio
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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.