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Finding the Fourth Proportional to 288.21, 431.92 and 210.81

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Solution

The fourth proportional to 288.21, 431.92 and 210.81 is: 315.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.21 : 431.92 = 210.81 : x
  2. Step 2: Convert to fraction form
    288.21/431.92 = 210.81/x
  3. Step 3: Cross multiply
    288.21x = 431.92 × 210.81
  4. Step 4: Simplify right side
    288.21x = 91,052.00
  5. Step 5: Solve for x
    x = 91,052.00/288.21
  6. Step 6: Final answer
    x = 315.92

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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.