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Finding the Fourth Proportional to 432.78, 648.71 and 213.10

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Solution

The fourth proportional to 432.78, 648.71 and 213.10 is: 319.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.78 : 648.71 = 213.10 : x
  2. Step 2: Convert to fraction form
    432.78/648.71 = 213.10/x
  3. Step 3: Cross multiply
    432.78x = 648.71 × 213.10
  4. Step 4: Simplify right side
    432.78x = 138,237.41
  5. Step 5: Solve for x
    x = 138,237.41/432.78
  6. Step 6: Final answer
    x = 319.42

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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.