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Finding the Fourth Proportional to 453.60, 680.36 and 128.98

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Solution

The fourth proportional to 453.60, 680.36 and 128.98 is: 193.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.60 : 680.36 = 128.98 : x
  2. Step 2: Convert to fraction form
    453.60/680.36 = 128.98/x
  3. Step 3: Cross multiply
    453.60x = 680.36 × 128.98
  4. Step 4: Simplify right side
    453.60x = 87,752.83
  5. Step 5: Solve for x
    x = 87,752.83/453.60
  6. Step 6: Final answer
    x = 193.46

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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.