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Finding the Fourth Proportional to 432.78, 648.60 and 216.06

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Solution

The fourth proportional to 432.78, 648.60 and 216.06 is: 323.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.78 : 648.60 = 216.06 : x
  2. Step 2: Convert to fraction form
    432.78/648.60 = 216.06/x
  3. Step 3: Cross multiply
    432.78x = 648.60 × 216.06
  4. Step 4: Simplify right side
    432.78x = 140,136.52
  5. Step 5: Solve for x
    x = 140,136.52/432.78
  6. Step 6: Final answer
    x = 323.81

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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.