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Finding the Fourth Proportional to 288.06, 431.85 and 133.92

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Solution

The fourth proportional to 288.06, 431.85 and 133.92 is: 200.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.06 : 431.85 = 133.92 : x
  2. Step 2: Convert to fraction form
    288.06/431.85 = 133.92/x
  3. Step 3: Cross multiply
    288.06x = 431.85 × 133.92
  4. Step 4: Simplify right side
    288.06x = 57,833.35
  5. Step 5: Solve for x
    x = 57,833.35/288.06
  6. Step 6: Final answer
    x = 200.77

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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.