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Finding the Fourth Proportional to 279.77, 385.90 and 169.28

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Solution

The fourth proportional to 279.77, 385.90 and 169.28 is: 233.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.77 : 385.90 = 169.28 : x
  2. Step 2: Convert to fraction form
    279.77/385.90 = 169.28/x
  3. Step 3: Cross multiply
    279.77x = 385.90 × 169.28
  4. Step 4: Simplify right side
    279.77x = 65,325.15
  5. Step 5: Solve for x
    x = 65,325.15/279.77
  6. Step 6: Final answer
    x = 233.50

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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.