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Finding the Fourth Proportional to 202.95, 280.11 and 129.35

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Solution

The fourth proportional to 202.95, 280.11 and 129.35 is: 178.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.95 : 280.11 = 129.35 : x
  2. Step 2: Convert to fraction form
    202.95/280.11 = 129.35/x
  3. Step 3: Cross multiply
    202.95x = 280.11 × 129.35
  4. Step 4: Simplify right side
    202.95x = 36,232.23
  5. Step 5: Solve for x
    x = 36,232.23/202.95
  6. Step 6: Final answer
    x = 178.53

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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.