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Finding the Fourth Proportional to 288.10, 431.09 and 214.49

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Solution

The fourth proportional to 288.10, 431.09 and 214.49 is: 320.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.10 : 431.09 = 214.49 : x
  2. Step 2: Convert to fraction form
    288.10/431.09 = 214.49/x
  3. Step 3: Cross multiply
    288.10x = 431.09 × 214.49
  4. Step 4: Simplify right side
    288.10x = 92,465.30
  5. Step 5: Solve for x
    x = 92,465.30/288.10
  6. Step 6: Final answer
    x = 320.95

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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.