Finding the Fourth Proportional to 390,134.36, 538,169.85 and 317,615.26
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Solution
The fourth proportional to 390,134.36, 538,169.85 and 317,615.26 is: 438,133.56
Step by Step Solution
- Step 1: Write the proportion equation
390,134.36 : 538,169.85 = 317,615.26 : x - Step 2: Convert to fraction form
390,134.36/538,169.85 = 317,615.26/x - Step 3: Cross multiply
390,134.36x = 538,169.85 × 317,615.26 - Step 4: Simplify right side
390,134.36x = 170,930,955,602.26 - Step 5: Solve for x
x = 170,930,955,602.26/390,134.36 - Step 6: Final answer
x = 438,133.56
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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.