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Finding the Fourth Proportional to 130.80, 196.21 and 39.49

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Solution

The fourth proportional to 130.80, 196.21 and 39.49 is: 59.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.80 : 196.21 = 39.49 : x
  2. Step 2: Convert to fraction form
    130.80/196.21 = 39.49/x
  3. Step 3: Cross multiply
    130.80x = 196.21 × 39.49
  4. Step 4: Simplify right side
    130.80x = 7,748.33
  5. Step 5: Solve for x
    x = 7,748.33/130.80
  6. Step 6: Final answer
    x = 59.24

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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.