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Finding the Fourth Proportional to 387.03, 533.74 and 255.81

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Solution

The fourth proportional to 387.03, 533.74 and 255.81 is: 352.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.03 : 533.74 = 255.81 : x
  2. Step 2: Convert to fraction form
    387.03/533.74 = 255.81/x
  3. Step 3: Cross multiply
    387.03x = 533.74 × 255.81
  4. Step 4: Simplify right side
    387.03x = 136,536.03
  5. Step 5: Solve for x
    x = 136,536.03/387.03
  6. Step 6: Final answer
    x = 352.78

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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.