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Finding the Fourth Proportional to 130.69, 195.78 and 69.74

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Solution

The fourth proportional to 130.69, 195.78 and 69.74 is: 104.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.69 : 195.78 = 69.74 : x
  2. Step 2: Convert to fraction form
    130.69/195.78 = 69.74/x
  3. Step 3: Cross multiply
    130.69x = 195.78 × 69.74
  4. Step 4: Simplify right side
    130.69x = 13,653.70
  5. Step 5: Solve for x
    x = 13,653.70/130.69
  6. Step 6: Final answer
    x = 104.47

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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.