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Finding the Fourth Proportional to 146.72, 218.32 and 139.04

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Solution

The fourth proportional to 146.72, 218.32 and 139.04 is: 206.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.72 : 218.32 = 139.04 : x
  2. Step 2: Convert to fraction form
    146.72/218.32 = 139.04/x
  3. Step 3: Cross multiply
    146.72x = 218.32 × 139.04
  4. Step 4: Simplify right side
    146.72x = 30,355.21
  5. Step 5: Solve for x
    x = 30,355.21/146.72
  6. Step 6: Final answer
    x = 206.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.