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Finding the Fourth Proportional to 431.96, 648.14 and 215.68

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Solution

The fourth proportional to 431.96, 648.14 and 215.68 is: 323.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.96 : 648.14 = 215.68 : x
  2. Step 2: Convert to fraction form
    431.96/648.14 = 215.68/x
  3. Step 3: Cross multiply
    431.96x = 648.14 × 215.68
  4. Step 4: Simplify right side
    431.96x = 139,790.84
  5. Step 5: Solve for x
    x = 139,790.84/431.96
  6. Step 6: Final answer
    x = 323.62

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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.