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Finding the Fourth Proportional to 288.01, 431.48 and 255.61

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Solution

The fourth proportional to 288.01, 431.48 and 255.61 is: 382.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.01 : 431.48 = 255.61 : x
  2. Step 2: Convert to fraction form
    288.01/431.48 = 255.61/x
  3. Step 3: Cross multiply
    288.01x = 431.48 × 255.61
  4. Step 4: Simplify right side
    288.01x = 110,289.32
  5. Step 5: Solve for x
    x = 110,289.32/288.01
  6. Step 6: Final answer
    x = 382.94

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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.