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Finding the Fourth Proportional to 203.55, 305.28 and 130.21

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Solution

The fourth proportional to 203.55, 305.28 and 130.21 is: 195.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.55 : 305.28 = 130.21 : x
  2. Step 2: Convert to fraction form
    203.55/305.28 = 130.21/x
  3. Step 3: Cross multiply
    203.55x = 305.28 × 130.21
  4. Step 4: Simplify right side
    203.55x = 39,748.98
  5. Step 5: Solve for x
    x = 39,748.98/203.55
  6. Step 6: Final answer
    x = 195.28

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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.