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Finding the Fourth Proportional to 202.64, 279.74 and 129.05

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Solution

The fourth proportional to 202.64, 279.74 and 129.05 is: 178.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.64 : 279.74 = 129.05 : x
  2. Step 2: Convert to fraction form
    202.64/279.74 = 129.05/x
  3. Step 3: Cross multiply
    202.64x = 279.74 × 129.05
  4. Step 4: Simplify right side
    202.64x = 36,099.80
  5. Step 5: Solve for x
    x = 36,099.80/202.64
  6. Step 6: Final answer
    x = 178.15

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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.