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Finding the Fourth Proportional to 287.76, 431.10 and 255.36

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Solution

The fourth proportional to 287.76, 431.10 and 255.36 is: 382.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.76 : 431.10 = 255.36 : x
  2. Step 2: Convert to fraction form
    287.76/431.10 = 255.36/x
  3. Step 3: Cross multiply
    287.76x = 431.10 × 255.36
  4. Step 4: Simplify right side
    287.76x = 110,085.70
  5. Step 5: Solve for x
    x = 110,085.70/287.76
  6. Step 6: Final answer
    x = 382.56

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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.