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Finding the Fourth Proportional to 432.88, 648.90 and 215.80

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Solution

The fourth proportional to 432.88, 648.90 and 215.80 is: 323.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.88 : 648.90 = 215.80 : x
  2. Step 2: Convert to fraction form
    432.88/648.90 = 215.80/x
  3. Step 3: Cross multiply
    432.88x = 648.90 × 215.80
  4. Step 4: Simplify right side
    432.88x = 140,032.62
  5. Step 5: Solve for x
    x = 140,032.62/432.88
  6. Step 6: Final answer
    x = 323.49

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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.