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Finding the Fourth Proportional to 255.28, 352.18 and 156.87

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Solution

The fourth proportional to 255.28, 352.18 and 156.87 is: 216.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.28 : 352.18 = 156.87 : x
  2. Step 2: Convert to fraction form
    255.28/352.18 = 156.87/x
  3. Step 3: Cross multiply
    255.28x = 352.18 × 156.87
  4. Step 4: Simplify right side
    255.28x = 55,246.48
  5. Step 5: Solve for x
    x = 55,246.48/255.28
  6. Step 6: Final answer
    x = 216.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.