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Finding the Fourth Proportional to 130.49, 195.77 and 128.20

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Solution

The fourth proportional to 130.49, 195.77 and 128.20 is: 192.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.49 : 195.77 = 128.20 : x
  2. Step 2: Convert to fraction form
    130.49/195.77 = 128.20/x
  3. Step 3: Cross multiply
    130.49x = 195.77 × 128.20
  4. Step 4: Simplify right side
    130.49x = 25,097.71
  5. Step 5: Solve for x
    x = 25,097.71/130.49
  6. Step 6: Final answer
    x = 192.33

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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.