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Finding the Fourth Proportional to 320.66, 480.83 and 104.21

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Solution

The fourth proportional to 320.66, 480.83 and 104.21 is: 156.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.66 : 480.83 = 104.21 : x
  2. Step 2: Convert to fraction form
    320.66/480.83 = 104.21/x
  3. Step 3: Cross multiply
    320.66x = 480.83 × 104.21
  4. Step 4: Simplify right side
    320.66x = 50,108.76
  5. Step 5: Solve for x
    x = 50,108.76/320.66
  6. Step 6: Final answer
    x = 156.27

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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.