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Finding the Fourth Proportional to 454.21, 681.72 and 281.21

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Solution

The fourth proportional to 454.21, 681.72 and 281.21 is: 422.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.21 : 681.72 = 281.21 : x
  2. Step 2: Convert to fraction form
    454.21/681.72 = 281.21/x
  3. Step 3: Cross multiply
    454.21x = 681.72 × 281.21
  4. Step 4: Simplify right side
    454.21x = 191,702.02
  5. Step 5: Solve for x
    x = 191,702.02/454.21
  6. Step 6: Final answer
    x = 422.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.