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Finding the Fourth Proportional to 202.95, 304.47 and 129.80

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Solution

The fourth proportional to 202.95, 304.47 and 129.80 is: 194.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.95 : 304.47 = 129.80 : x
  2. Step 2: Convert to fraction form
    202.95/304.47 = 129.80/x
  3. Step 3: Cross multiply
    202.95x = 304.47 × 129.80
  4. Step 4: Simplify right side
    202.95x = 39,519.22
  5. Step 5: Solve for x
    x = 39,519.22/202.95
  6. Step 6: Final answer
    x = 194.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.