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Finding the Fourth Proportional to 395.12, 543.68 and 316.48

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Solution

The fourth proportional to 395.12, 543.68 and 316.48 is: 435.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.12 : 543.68 = 316.48 : x
  2. Step 2: Convert to fraction form
    395.12/543.68 = 316.48/x
  3. Step 3: Cross multiply
    395.12x = 543.68 × 316.48
  4. Step 4: Simplify right side
    395.12x = 172,063.85
  5. Step 5: Solve for x
    x = 172,063.85/395.12
  6. Step 6: Final answer
    x = 435.47

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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.