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Finding the Fourth Proportional to 202.98, 279.98 and 129.28

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Solution

The fourth proportional to 202.98, 279.98 and 129.28 is: 178.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.98 : 279.98 = 129.28 : x
  2. Step 2: Convert to fraction form
    202.98/279.98 = 129.28/x
  3. Step 3: Cross multiply
    202.98x = 279.98 × 129.28
  4. Step 4: Simplify right side
    202.98x = 36,197.02
  5. Step 5: Solve for x
    x = 36,197.02/202.98
  6. Step 6: Final answer
    x = 178.33

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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.