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Finding the Fourth Proportional to 280.73, 420.82 and 98

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Solution

The fourth proportional to 280.73, 420.82 and 98 is: 146.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.73 : 420.82 = 98 : x
  2. Step 2: Convert to fraction form
    280.73/420.82 = 98/x
  3. Step 3: Cross multiply
    280.73x = 420.82 × 98
  4. Step 4: Simplify right side
    280.73x = 41,240.36
  5. Step 5: Solve for x
    x = 41,240.36/280.73
  6. Step 6: Final answer
    x = 146.90

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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.