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Finding the Fourth Proportional to 149.21, 206.00 and 100.17

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Solution

The fourth proportional to 149.21, 206.00 and 100.17 is: 138.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.21 : 206.00 = 100.17 : x
  2. Step 2: Convert to fraction form
    149.21/206.00 = 100.17/x
  3. Step 3: Cross multiply
    149.21x = 206.00 × 100.17
  4. Step 4: Simplify right side
    149.21x = 20,635.27
  5. Step 5: Solve for x
    x = 20,635.27/149.21
  6. Step 6: Final answer
    x = 138.29

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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.