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Finding the Fourth Proportional to 202.62, 279.51 and 128.02

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Solution

The fourth proportional to 202.62, 279.51 and 128.02 is: 176.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.62 : 279.51 = 128.02 : x
  2. Step 2: Convert to fraction form
    202.62/279.51 = 128.02/x
  3. Step 3: Cross multiply
    202.62x = 279.51 × 128.02
  4. Step 4: Simplify right side
    202.62x = 35,783.90
  5. Step 5: Solve for x
    x = 35,783.90/202.62
  6. Step 6: Final answer
    x = 176.61

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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.