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Finding the Fourth Proportional to 288.12, 431.88 and 215.76

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Solution

The fourth proportional to 288.12, 431.88 and 215.76 is: 323.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.12 : 431.88 = 215.76 : x
  2. Step 2: Convert to fraction form
    288.12/431.88 = 215.76/x
  3. Step 3: Cross multiply
    288.12x = 431.88 × 215.76
  4. Step 4: Simplify right side
    288.12x = 93,182.43
  5. Step 5: Solve for x
    x = 93,182.43/288.12
  6. Step 6: Final answer
    x = 323.42

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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.