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Finding the Fourth Proportional to 130.24, 194.82 and 128.62

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Solution

The fourth proportional to 130.24, 194.82 and 128.62 is: 192.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.24 : 194.82 = 128.62 : x
  2. Step 2: Convert to fraction form
    130.24/194.82 = 128.62/x
  3. Step 3: Cross multiply
    130.24x = 194.82 × 128.62
  4. Step 4: Simplify right side
    130.24x = 25,057.75
  5. Step 5: Solve for x
    x = 25,057.75/130.24
  6. Step 6: Final answer
    x = 192.40

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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.