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Finding the Fourth Proportional to 148.85, 205.51 and 102.21

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Solution

The fourth proportional to 148.85, 205.51 and 102.21 is: 141.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.85 : 205.51 = 102.21 : x
  2. Step 2: Convert to fraction form
    148.85/205.51 = 102.21/x
  3. Step 3: Cross multiply
    148.85x = 205.51 × 102.21
  4. Step 4: Simplify right side
    148.85x = 21,005.30
  5. Step 5: Solve for x
    x = 21,005.30/148.85
  6. Step 6: Final answer
    x = 141.11

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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.