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Finding the Fourth Proportional to 486.13, 729.22 and 139.43

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Solution

The fourth proportional to 486.13, 729.22 and 139.43 is: 209.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.13 : 729.22 = 139.43 : x
  2. Step 2: Convert to fraction form
    486.13/729.22 = 139.43/x
  3. Step 3: Cross multiply
    486.13x = 729.22 × 139.43
  4. Step 4: Simplify right side
    486.13x = 101,671.50
  5. Step 5: Solve for x
    x = 101,671.50/486.13
  6. Step 6: Final answer
    x = 209.14

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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.