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Finding the Fourth Proportional to 280.98, 421.52 and 105.31

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Solution

The fourth proportional to 280.98, 421.52 and 105.31 is: 157.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.98 : 421.52 = 105.31 : x
  2. Step 2: Convert to fraction form
    280.98/421.52 = 105.31/x
  3. Step 3: Cross multiply
    280.98x = 421.52 × 105.31
  4. Step 4: Simplify right side
    280.98x = 44,388.69
  5. Step 5: Solve for x
    x = 44,388.69/280.98
  6. Step 6: Final answer
    x = 157.98

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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.