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Finding the Fourth Proportional to 421.31, 581.41 and 246.66

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Solution

The fourth proportional to 421.31, 581.41 and 246.66 is: 340.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.31 : 581.41 = 246.66 : x
  2. Step 2: Convert to fraction form
    421.31/581.41 = 246.66/x
  3. Step 3: Cross multiply
    421.31x = 581.41 × 246.66
  4. Step 4: Simplify right side
    421.31x = 143,408.72
  5. Step 5: Solve for x
    x = 143,408.72/421.31
  6. Step 6: Final answer
    x = 340.39

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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.