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Finding the Fourth Proportional to 432.70, 648.54 and 215.83

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Solution

The fourth proportional to 432.70, 648.54 and 215.83 is: 323.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.70 : 648.54 = 215.83 : x
  2. Step 2: Convert to fraction form
    432.70/648.54 = 215.83/x
  3. Step 3: Cross multiply
    432.70x = 648.54 × 215.83
  4. Step 4: Simplify right side
    432.70x = 139,974.39
  5. Step 5: Solve for x
    x = 139,974.39/432.70
  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.