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Finding the Fourth Proportional to 393.03, 543.31 and 315.12

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Solution

The fourth proportional to 393.03, 543.31 and 315.12 is: 435.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.03 : 543.31 = 315.12 : x
  2. Step 2: Convert to fraction form
    393.03/543.31 = 315.12/x
  3. Step 3: Cross multiply
    393.03x = 543.31 × 315.12
  4. Step 4: Simplify right side
    393.03x = 171,207.85
  5. Step 5: Solve for x
    x = 171,207.85/393.03
  6. Step 6: Final answer
    x = 435.61

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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.