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Finding the Fourth Proportional to 280.57, 420.81 and 134.41

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Solution

The fourth proportional to 280.57, 420.81 and 134.41 is: 201.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.57 : 420.81 = 134.41 : x
  2. Step 2: Convert to fraction form
    280.57/420.81 = 134.41/x
  3. Step 3: Cross multiply
    280.57x = 420.81 × 134.41
  4. Step 4: Simplify right side
    280.57x = 56,560.02
  5. Step 5: Solve for x
    x = 56,560.02/280.57
  6. Step 6: Final answer
    x = 201.59

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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.