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Finding the Fourth Proportional to 421.32, 581.48 and 255.64

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Solution

The fourth proportional to 421.32, 581.48 and 255.64 is: 352.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.32 : 581.48 = 255.64 : x
  2. Step 2: Convert to fraction form
    421.32/581.48 = 255.64/x
  3. Step 3: Cross multiply
    421.32x = 581.48 × 255.64
  4. Step 4: Simplify right side
    421.32x = 148,649.55
  5. Step 5: Solve for x
    x = 148,649.55/421.32
  6. Step 6: Final answer
    x = 352.82

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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.