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Finding the Fourth Proportional to 280.34, 386.94 and 169.80

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Solution

The fourth proportional to 280.34, 386.94 and 169.80 is: 234.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.34 : 386.94 = 169.80 : x
  2. Step 2: Convert to fraction form
    280.34/386.94 = 169.80/x
  3. Step 3: Cross multiply
    280.34x = 386.94 × 169.80
  4. Step 4: Simplify right side
    280.34x = 65,701.66
  5. Step 5: Solve for x
    x = 65,701.66/280.34
  6. Step 6: Final answer
    x = 234.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.