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Finding the Fourth Proportional to 202.13, 278.90 and 128.43

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Solution

The fourth proportional to 202.13, 278.90 and 128.43 is: 177.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.13 : 278.90 = 128.43 : x
  2. Step 2: Convert to fraction form
    202.13/278.90 = 128.43/x
  3. Step 3: Cross multiply
    202.13x = 278.90 × 128.43
  4. Step 4: Simplify right side
    202.13x = 35,819.13
  5. Step 5: Solve for x
    x = 35,819.13/202.13
  6. Step 6: Final answer
    x = 177.21

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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.