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Finding the Fourth Proportional to 143.16, 213.65 and 139.52

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Solution

The fourth proportional to 143.16, 213.65 and 139.52 is: 208.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.16 : 213.65 = 139.52 : x
  2. Step 2: Convert to fraction form
    143.16/213.65 = 139.52/x
  3. Step 3: Cross multiply
    143.16x = 213.65 × 139.52
  4. Step 4: Simplify right side
    143.16x = 29,806.68
  5. Step 5: Solve for x
    x = 29,806.68/143.16
  6. Step 6: Final answer
    x = 208.21

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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.