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Finding the Fourth Proportional to 320, 479.91 and 103.55

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Solution

The fourth proportional to 320, 479.91 and 103.55 is: 155.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    320 : 479.91 = 103.55 : x
  2. Step 2: Convert to fraction form
    320/479.91 = 103.55/x
  3. Step 3: Cross multiply
    320x = 479.91 × 103.55
  4. Step 4: Simplify right side
    320x = 49,694.68
  5. Step 5: Solve for x
    x = 49,694.68/320
  6. Step 6: Final answer
    x = 155.30

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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.