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Finding the Fourth Proportional to 280.21, 420.38 and 97.56

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Solution

The fourth proportional to 280.21, 420.38 and 97.56 is: 146.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.21 : 420.38 = 97.56 : x
  2. Step 2: Convert to fraction form
    280.21/420.38 = 97.56/x
  3. Step 3: Cross multiply
    280.21x = 420.38 × 97.56
  4. Step 4: Simplify right side
    280.21x = 41,012.27
  5. Step 5: Solve for x
    x = 41,012.27/280.21
  6. Step 6: Final answer
    x = 146.36

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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.