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Finding the Fourth Proportional to 487.21, 730.41 and 213.22

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Solution

The fourth proportional to 487.21, 730.41 and 213.22 is: 319.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.21 : 730.41 = 213.22 : x
  2. Step 2: Convert to fraction form
    487.21/730.41 = 213.22/x
  3. Step 3: Cross multiply
    487.21x = 730.41 × 213.22
  4. Step 4: Simplify right side
    487.21x = 155,738.02
  5. Step 5: Solve for x
    x = 155,738.02/487.21
  6. Step 6: Final answer
    x = 319.65

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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.