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Finding the Fourth Proportional to 143.68, 214.06 and 139.12

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Solution

The fourth proportional to 143.68, 214.06 and 139.12 is: 207.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.68 : 214.06 = 139.12 : x
  2. Step 2: Convert to fraction form
    143.68/214.06 = 139.12/x
  3. Step 3: Cross multiply
    143.68x = 214.06 × 139.12
  4. Step 4: Simplify right side
    143.68x = 29,780.03
  5. Step 5: Solve for x
    x = 29,780.03/143.68
  6. Step 6: Final answer
    x = 207.27

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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.