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Finding the Fourth Proportional to 453.25, 679.83 and 128.53

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Solution

The fourth proportional to 453.25, 679.83 and 128.53 is: 192.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.25 : 679.83 = 128.53 : x
  2. Step 2: Convert to fraction form
    453.25/679.83 = 128.53/x
  3. Step 3: Cross multiply
    453.25x = 679.83 × 128.53
  4. Step 4: Simplify right side
    453.25x = 87,378.55
  5. Step 5: Solve for x
    x = 87,378.55/453.25
  6. Step 6: Final answer
    x = 192.78

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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.