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Finding the Fourth Proportional to 280.62, 420.91 and 134.47

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Solution

The fourth proportional to 280.62, 420.91 and 134.47 is: 201.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.62 : 420.91 = 134.47 : x
  2. Step 2: Convert to fraction form
    280.62/420.91 = 134.47/x
  3. Step 3: Cross multiply
    280.62x = 420.91 × 134.47
  4. Step 4: Simplify right side
    280.62x = 56,599.96
  5. Step 5: Solve for x
    x = 56,599.96/280.62
  6. Step 6: Final answer
    x = 201.70

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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.