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Finding the Fourth Proportional to 320.19, 480.28 and 211.95

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Solution

The fourth proportional to 320.19, 480.28 and 211.95 is: 317.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.19 : 480.28 = 211.95 : x
  2. Step 2: Convert to fraction form
    320.19/480.28 = 211.95/x
  3. Step 3: Cross multiply
    320.19x = 480.28 × 211.95
  4. Step 4: Simplify right side
    320.19x = 101,794.82
  5. Step 5: Solve for x
    x = 101,794.82/320.19
  6. Step 6: Final answer
    x = 317.92

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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.