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Finding the Fourth Proportional to 143.81, 215.30 and 109.71

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Solution

The fourth proportional to 143.81, 215.30 and 109.71 is: 164.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.81 : 215.30 = 109.71 : x
  2. Step 2: Convert to fraction form
    143.81/215.30 = 109.71/x
  3. Step 3: Cross multiply
    143.81x = 215.30 × 109.71
  4. Step 4: Simplify right side
    143.81x = 23,620.84
  5. Step 5: Solve for x
    x = 23,620.84/143.81
  6. Step 6: Final answer
    x = 164.25

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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.