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Finding the Fourth Proportional to 320.22, 479.52 and 212.13

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Solution

The fourth proportional to 320.22, 479.52 and 212.13 is: 317.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.22 : 479.52 = 212.13 : x
  2. Step 2: Convert to fraction form
    320.22/479.52 = 212.13/x
  3. Step 3: Cross multiply
    320.22x = 479.52 × 212.13
  4. Step 4: Simplify right side
    320.22x = 101,720.58
  5. Step 5: Solve for x
    x = 101,720.58/320.22
  6. Step 6: Final answer
    x = 317.66

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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.