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Finding the Fourth Proportional to 130.40, 195.40 and 84.68

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Solution

The fourth proportional to 130.40, 195.40 and 84.68 is: 126.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.40 : 195.40 = 84.68 : x
  2. Step 2: Convert to fraction form
    130.40/195.40 = 84.68/x
  3. Step 3: Cross multiply
    130.40x = 195.40 × 84.68
  4. Step 4: Simplify right side
    130.40x = 16,546.47
  5. Step 5: Solve for x
    x = 16,546.47/130.40
  6. Step 6: Final answer
    x = 126.89

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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.