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Finding the Fourth Proportional to 315.50, 472.38 and 170.90

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Solution

The fourth proportional to 315.50, 472.38 and 170.90 is: 255.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.50 : 472.38 = 170.90 : x
  2. Step 2: Convert to fraction form
    315.50/472.38 = 170.90/x
  3. Step 3: Cross multiply
    315.50x = 472.38 × 170.90
  4. Step 4: Simplify right side
    315.50x = 80,729.74
  5. Step 5: Solve for x
    x = 80,729.74/315.50
  6. Step 6: Final answer
    x = 255.88

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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.