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Finding the Fourth Proportional to 432.21, 648.15 and 215.64

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Solution

The fourth proportional to 432.21, 648.15 and 215.64 is: 323.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.21 : 648.15 = 215.64 : x
  2. Step 2: Convert to fraction form
    432.21/648.15 = 215.64/x
  3. Step 3: Cross multiply
    432.21x = 648.15 × 215.64
  4. Step 4: Simplify right side
    432.21x = 139,767.07
  5. Step 5: Solve for x
    x = 139,767.07/432.21
  6. Step 6: Final answer
    x = 323.38

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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.