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Finding the Fourth Proportional to 213.13, 294.03 and 139.42

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Solution

The fourth proportional to 213.13, 294.03 and 139.42 is: 192.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.13 : 294.03 = 139.42 : x
  2. Step 2: Convert to fraction form
    213.13/294.03 = 139.42/x
  3. Step 3: Cross multiply
    213.13x = 294.03 × 139.42
  4. Step 4: Simplify right side
    213.13x = 40,993.66
  5. Step 5: Solve for x
    x = 40,993.66/213.13
  6. Step 6: Final answer
    x = 192.34

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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.