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Finding the Fourth Proportional to 202.76, 279.94 and 128.10

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Solution

The fourth proportional to 202.76, 279.94 and 128.10 is: 176.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.76 : 279.94 = 128.10 : x
  2. Step 2: Convert to fraction form
    202.76/279.94 = 128.10/x
  3. Step 3: Cross multiply
    202.76x = 279.94 × 128.10
  4. Step 4: Simplify right side
    202.76x = 35,860.31
  5. Step 5: Solve for x
    x = 35,860.31/202.76
  6. Step 6: Final answer
    x = 176.86

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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.