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Finding the Fourth Proportional to 106.30, 145.43 and 105.84

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Solution

The fourth proportional to 106.30, 145.43 and 105.84 is: 144.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.30 : 145.43 = 105.84 : x
  2. Step 2: Convert to fraction form
    106.30/145.43 = 105.84/x
  3. Step 3: Cross multiply
    106.30x = 145.43 × 105.84
  4. Step 4: Simplify right side
    106.30x = 15,391.78
  5. Step 5: Solve for x
    x = 15,391.78/106.30
  6. Step 6: Final answer
    x = 144.80

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.