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Finding the Fourth Proportional to 202.58, 279.30 and 128.86

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Solution

The fourth proportional to 202.58, 279.30 and 128.86 is: 177.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.58 : 279.30 = 128.86 : x
  2. Step 2: Convert to fraction form
    202.58/279.30 = 128.86/x
  3. Step 3: Cross multiply
    202.58x = 279.30 × 128.86
  4. Step 4: Simplify right side
    202.58x = 35,990.60
  5. Step 5: Solve for x
    x = 35,990.60/202.58
  6. Step 6: Final answer
    x = 177.66

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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.