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Finding the Fourth Proportional to 421.41, 581.56 and 255.53

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Solution

The fourth proportional to 421.41, 581.56 and 255.53 is: 352.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.41 : 581.56 = 255.53 : x
  2. Step 2: Convert to fraction form
    421.41/581.56 = 255.53/x
  3. Step 3: Cross multiply
    421.41x = 581.56 × 255.53
  4. Step 4: Simplify right side
    421.41x = 148,606.64
  5. Step 5: Solve for x
    x = 148,606.64/421.41
  6. Step 6: Final answer
    x = 352.64

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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.