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Finding the Fourth Proportional to 454.85, 681.28 and 281.56

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Solution

The fourth proportional to 454.85, 681.28 and 281.56 is: 421.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.85 : 681.28 = 281.56 : x
  2. Step 2: Convert to fraction form
    454.85/681.28 = 281.56/x
  3. Step 3: Cross multiply
    454.85x = 681.28 × 281.56
  4. Step 4: Simplify right side
    454.85x = 191,820.07
  5. Step 5: Solve for x
    x = 191,820.07/454.85
  6. Step 6: Final answer
    x = 421.72

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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.