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Finding the Fourth Proportional to 303.20, 455.20 and 140.79

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Solution

The fourth proportional to 303.20, 455.20 and 140.79 is: 211.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.20 : 455.20 = 140.79 : x
  2. Step 2: Convert to fraction form
    303.20/455.20 = 140.79/x
  3. Step 3: Cross multiply
    303.20x = 455.20 × 140.79
  4. Step 4: Simplify right side
    303.20x = 64,087.61
  5. Step 5: Solve for x
    x = 64,087.61/303.20
  6. Step 6: Final answer
    x = 211.37

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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.