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Finding the Fourth Proportional to 255.16, 351.40 and 239.68

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Solution

The fourth proportional to 255.16, 351.40 and 239.68 is: 330.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.16 : 351.40 = 239.68 : x
  2. Step 2: Convert to fraction form
    255.16/351.40 = 239.68/x
  3. Step 3: Cross multiply
    255.16x = 351.40 × 239.68
  4. Step 4: Simplify right side
    255.16x = 84,223.55
  5. Step 5: Solve for x
    x = 84,223.55/255.16
  6. Step 6: Final answer
    x = 330.08

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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.