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Finding the Fourth Proportional to 106.21, 159.31 and 45.38

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Solution

The fourth proportional to 106.21, 159.31 and 45.38 is: 68.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.21 : 159.31 = 45.38 : x
  2. Step 2: Convert to fraction form
    106.21/159.31 = 45.38/x
  3. Step 3: Cross multiply
    106.21x = 159.31 × 45.38
  4. Step 4: Simplify right side
    106.21x = 7,229.49
  5. Step 5: Solve for x
    x = 7,229.49/106.21
  6. Step 6: Final answer
    x = 68.07

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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.