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Finding the Fourth Proportional to 202.87, 279.94 and 120

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Solution

The fourth proportional to 202.87, 279.94 and 120 is: 165.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.87 : 279.94 = 120 : x
  2. Step 2: Convert to fraction form
    202.87/279.94 = 120/x
  3. Step 3: Cross multiply
    202.87x = 279.94 × 120
  4. Step 4: Simplify right side
    202.87x = 33,592.80
  5. Step 5: Solve for x
    x = 33,592.80/202.87
  6. Step 6: Final answer
    x = 165.59

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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.