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Finding the Fourth Proportional to 155.19, 213.78 and 130.62

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Solution

The fourth proportional to 155.19, 213.78 and 130.62 is: 179.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.19 : 213.78 = 130.62 : x
  2. Step 2: Convert to fraction form
    155.19/213.78 = 130.62/x
  3. Step 3: Cross multiply
    155.19x = 213.78 × 130.62
  4. Step 4: Simplify right side
    155.19x = 27,923.94
  5. Step 5: Solve for x
    x = 27,923.94/155.19
  6. Step 6: Final answer
    x = 179.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.